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Intermittent stack overflow on mac debug compiling cssparser without dummy_match_byte. #21038

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emilio opened this issue Jun 12, 2018 · 6 comments
Closed

Intermittent stack overflow on mac debug compiling cssparser without dummy_match_byte. #21038

emilio opened this issue Jun 12, 2018 · 6 comments

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@emilio
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emilio commented Jun 12, 2018 •
edited

Here's the suspected backtrace (that is, the backtrace of the first stack overflow that I managed to reproduce locally playing with the thread stack size:

#0  0x000055d3f34182de in <core::cell::RefCell<T>>::borrow (self=0x7f762d072eb0) at /checkout/src/libcore/cell.rs:736
#1  0x000055d3f341f492 in proc_macro2::stable::Term::as_str::{{closure}} (interner=0x7f762d072eb0)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/proc-macro2-0.3.8/src/stable.rs:430
#2  0x000055d3f33fd073 in <std::thread::local::LocalKey<T>>::try_with (self=0x55d3f36d3168, f=...) at /checkout/src/libstd/thread/local.rs:294
#3  0x000055d3f33fcd9d in <std::thread::local::LocalKey<T>>::with (self=0x55d3f36d3168, f=...) at /checkout/src/libstd/thread/local.rs:248
#4  0x000055d3f341f457 in proc_macro2::stable::Term::as_str (self=0x7f762cfe02a8) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/proc-macro2-0.3.8/src/stable.rs:429
#5  0x000055d3f33ffe63 in proc_macro2::Term::as_str (self=0x7f762cfe02a8) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/proc-macro2-0.3.8/src/lib.rs:493
#6  0x000055d3f33ee2e3 in syn::ident::parsing::<impl syn::synom::Synom for syn::ident::Ident>::parse (input=...)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/ident.rs:254
#7  0x000055d3f32f7f7c in syn::path::parsing::<impl syn::synom::Synom for syn::path::PathSegment>::parse (i=...)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:69
#8  0x000055d3f33df8f8 in <syn::punctuated::Punctuated<T, P>>::parse (input=..., parse=0x55d3f32f7f00 <syn::path::parsing::<impl syn::synom::Synom for syn::path::PathSegment>::parse>, 
    terminated=false) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/punctuated.rs:723
#9  0x000055d3f33da535 in <syn::punctuated::Punctuated<T, P>>::parse_separated_nonempty_with (input=..., 
    parse=0x55d3f32f7f00 <syn::path::parsing::<impl syn::synom::Synom for syn::path::PathSegment>::parse>)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/punctuated.rs:691
#10 0x000055d3f33da00b in <syn::punctuated::Punctuated<T, P>>::parse_separated_nonempty (input=...)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/punctuated.rs:658
#11 0x000055d3f32f58f4 in syn::path::parsing::<impl syn::synom::Synom for syn::path::Path>::parse (i=...)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:69
#12 0x000055d3f336283c in syn::path::parsing::qpath (i=...) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:75
#13 0x000055d3f32961d8 in syn::expr::parsing::<impl syn::synom::Synom for syn::expr::ExprPath>::parse (i=...)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:69
#14 0x000055d3f339c1ea in syn::expr::parsing::atom_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:83
#15 0x000055d3f339679f in syn::expr::parsing::trailer_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:83
#16 0x000055d3f3395ffd in syn::expr::parsing::unary_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:83
#17 0x000055d3f33929af in syn::expr::parsing::cast_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:83
#18 0x000055d3f3390ec9 in syn::expr::parsing::term_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1315
#19 0x000055d3f338f549 in syn::expr::parsing::arith_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1302
#20 0x000055d3f338dbc9 in syn::expr::parsing::shift_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1290
#21 0x000055d3f338be09 in syn::expr::parsing::bitand_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1279
#22 0x000055d3f338a2d1 in syn::expr::parsing::bitxor_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1269
#23 0x000055d3f3388509 in syn::expr::parsing::bitor_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1262
#24 0x000055d3f33861b7 in syn::expr::parsing::compare_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1236
#25 0x000055d3f33848d9 in syn::expr::parsing::and_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1225
#26 0x000055d3f3383019 in syn::expr::parsing::or_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1222
#27 0x000055d3f3381640 in syn::expr::parsing::range_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:83
#28 0x000055d3f3380409 in syn::expr::parsing::placement_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:83
#29 0x000055d3f337e757 in syn::expr::parsing::assign_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:83
#30 0x000055d3f337e600 in syn::expr::parsing::ambiguous_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1074
#31 0x000055d3f3284333 in syn::expr::parsing::<impl syn::synom::Synom for syn::expr::Expr>::parse (i=...)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:69
#32 0x000055d3f33dcf98 in <syn::punctuated::Punctuated<T, P>>::parse (input=..., parse=0x55d3f3284300 <syn::expr::parsing::<impl syn::synom::Synom for syn::expr::Expr>::parse>, 
    terminated=true) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/punctuated.rs:723
#33 0x000055d3f33dab95 in <syn::punctuated::Punctuated<T, P>>::parse_terminated_with (input=..., 
    parse=0x55d3f3284300 <syn::expr::parsing::<impl syn::synom::Synom for syn::expr::Expr>::parse>)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/punctuated.rs:700
#34 0x000055d3f33da10b in <syn::punctuated::Punctuated<T, P>>::parse_terminated (input=...) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/punctuated.rs:664
#35 0x000055d3f339ff65 in syn::expr::parsing::and_call::{{closure}} (i=...) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1701
#36 0x000055d3f3327d88 in syn::token::parsing::delim (delim=..., tokens=..., new=0x55d3f32e5f90 <syn::token::Paren>, f=...)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/token.rs:764
#37 0x000055d3f32e5afe in syn::token::Paren::parse (tokens=..., f=...) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/token.rs:324
#38 0x000055d3f339ff35 in syn::expr::parsing::and_call (i=...) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:69
#39 0x000055d3f3396c27 in syn::expr::parsing::trailer_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:83
#40 0x000055d3f3395ffd in syn::expr::parsing::unary_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:83
#41 0x000055d3f33929af in syn::expr::parsing::cast_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:83
#42 0x000055d3f3390ec9 in syn::expr::parsing::term_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1315
#43 0x000055d3f338f549 in syn::expr::parsing::arith_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1302
#44 0x000055d3f338dbc9 in syn::expr::parsing::shift_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1290
#45 0x000055d3f338be09 in syn::expr::parsing::bitand_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1279
#46 0x000055d3f338a2d1 in syn::expr::parsing::bitxor_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1269
#47 0x000055d3f3388509 in syn::expr::parsing::bitor_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1262
#48 0x000055d3f33861b7 in syn::expr::parsing::compare_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1236
#49 0x000055d3f33848d9 in syn::expr::parsing::and_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1225
#50 0x000055d3f3383019 in syn::expr::parsing::or_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1222
#51 0x000055d3f3381640 in syn::expr::parsing::range_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:83
#52 0x000055d3f3380409 in syn::expr::parsing::placement_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:83
#53 0x000055d3f337e757 in syn::expr::parsing::assign_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:83
#54 0x000055d3f337e600 in syn::expr::parsing::ambiguous_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1074
#55 0x000055d3f3284333 in syn::expr::parsing::<impl syn::synom::Synom for syn::expr::Expr>::parse (i=...)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:69
#56 0x000055d3f33afc4c in syn::expr::parsing::stmt_expr (i=...) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:69
#57 0x000055d3f3299a69 in syn::expr::parsing::<impl syn::synom::Synom for syn::expr::Stmt>::parse (i=...)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:69
#58 0x000055d3f329717b in syn::expr::parsing::<impl syn::expr::Block>::parse_within (i=...) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:75
#59 0x000055d3f33aae65 in syn::expr::parsing::<impl syn::synom::Synom for syn::expr::Block>::parse::{{closure}} (i=...)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:2309
#60 0x000055d3f3327702 in syn::token::parsing::delim (delim=..., tokens=..., new=0x55d3f32e4c60 <syn::token::Brace>, f=...)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/token.rs:764
#61 0x000055d3f32e4ace in syn::token::Brace::parse (tokens=..., f=...) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/token.rs:324
#62 0x000055d3f3296685 in syn::expr::parsing::<impl syn::synom::Synom for syn::expr::Block>::parse (i=...)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:69
#63 0x000055d3f32954b8 in syn::expr::parsing::<impl syn::synom::Synom for syn::expr::ExprUnsafe>::parse (i=...)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:69
#64 0x000055d3f339bb2c in syn::expr::parsing::atom_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:83
#65 0x000055d3f339679f in syn::expr::parsing::trailer_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:83
#66 0x000055d3f3395ffd in syn::expr::parsing::unary_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:83
#67 0x000055d3f33929af in syn::expr::parsing::cast_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:83
#68 0x000055d3f3390ec9 in syn::expr::parsing::term_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1315
#69 0x000055d3f338f549 in syn::expr::parsing::arith_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1302
#70 0x000055d3f338dbc9 in syn::expr::parsing::shift_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1290
#71 0x000055d3f338be09 in syn::expr::parsing::bitand_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1279
#72 0x000055d3f338a2d1 in syn::expr::parsing::bitxor_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1269
#73 0x000055d3f3388509 in syn::expr::parsing::bitor_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1262
#74 0x000055d3f33861b7 in syn::expr::parsing::compare_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1236
#75 0x000055d3f33848d9 in syn::expr::parsing::and_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1225
#76 0x000055d3f3383019 in syn::expr::parsing::or_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1222
#77 0x000055d3f3381640 in syn::expr::parsing::range_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:83
#78 0x000055d3f3380409 in syn::expr::parsing::placement_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:83
#79 0x000055d3f337e757 in syn::expr::parsing::assign_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:83
#80 0x000055d3f337e600 in syn::expr::parsing::ambiguous_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1074
#81 0x000055d3f3284333 in syn::expr::parsing::<impl syn::synom::Synom for syn::expr::Expr>::parse (i=...)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:69
#82 0x000055d3f33dcf98 in <syn::punctuated::Punctuated<T, P>>::parse (input=..., parse=0x55d3f3284300 <syn::expr::parsing::<impl syn::synom::Synom for syn::expr::Expr>::parse>, 
    terminated=true) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/punctuated.rs:723
#83 0x000055d3f33dab95 in <syn::punctuated::Punctuated<T, P>>::parse_terminated_with (input=..., 
    parse=0x55d3f3284300 <syn::expr::parsing::<impl syn::synom::Synom for syn::expr::Expr>::parse>)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/punctuated.rs:700
#84 0x000055d3f33da10b in <syn::punctuated::Punctuated<T, P>>::parse_terminated (input=...) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/punctuated.rs:664
#85 0x000055d3f339ff65 in syn::expr::parsing::and_call::{{closure}} (i=...) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1701
#86 0x000055d3f3327d88 in syn::token::parsing::delim (delim=..., tokens=..., new=0x55d3f32e5f90 <syn::token::Paren>, f=...)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/token.rs:764
#87 0x000055d3f32e5afe in syn::token::Paren::parse (tokens=..., f=...) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/token.rs:324
#88 0x000055d3f339ff35 in syn::expr::parsing::and_call (i=...) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:69
#89 0x000055d3f3396c27 in syn::expr::parsing::trailer_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:83
#90 0x000055d3f3395ffd in syn::expr::parsing::unary_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:83
#91 0x000055d3f33929af in syn::expr::parsing::cast_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:83
#92 0x000055d3f3390ec9 in syn::expr::parsing::term_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1315
#93 0x000055d3f338f549 in syn::expr::parsing::arith_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1302
#94 0x000055d3f338dbc9 in syn::expr::parsing::shift_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1290
#95 0x000055d3f338be09 in syn::expr::parsing::bitand_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1279
#96 0x000055d3f338a2d1 in syn::expr::parsing::bitxor_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1269
#97 0x000055d3f3388509 in syn::expr::parsing::bitor_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1262
#98 0x000055d3f33861b7 in syn::expr::parsing::compare_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1236
#99 0x000055d3f33848d9 in syn::expr::parsing::and_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1225
#100 0x000055d3f3383019 in syn::expr::parsing::or_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1222
#101 0x000055d3f3381640 in syn::expr::parsing::range_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:83
#102 0x000055d3f3380409 in syn::expr::parsing::placement_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:83
#103 0x000055d3f337e757 in syn::expr::parsing::assign_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:83
#104 0x000055d3f337e600 in syn::expr::parsing::ambiguous_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1074
#105 0x000055d3f33a73a3 in syn::expr::parsing::expr_ret (i=..., allow_struct=true) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:83
#106 0x000055d3f339a2fc in syn::expr::parsing::atom_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:83
#107 0x000055d3f339679f in syn::expr::parsing::trailer_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:83
#108 0x000055d3f3395ffd in syn::expr::parsing::unary_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:83
#109 0x000055d3f33929af in syn::expr::parsing::cast_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:83
#110 0x000055d3f3390ec9 in syn::expr::parsing::term_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1315
#111 0x000055d3f338f549 in syn::expr::parsing::arith_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1302
#112 0x000055d3f338dbc9 in syn::expr::parsing::shift_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1290
#113 0x000055d3f338be09 in syn::expr::parsing::bitand_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1279
#114 0x000055d3f338a2d1 in syn::expr::parsing::bitxor_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1269
#115 0x000055d3f3388509 in syn::expr::parsing::bitor_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1262
#116 0x000055d3f33861b7 in syn::expr::parsing::compare_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1236
#117 0x000055d3f33848d9 in syn::expr::parsing::and_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1225
#118 0x000055d3f3383019 in syn::expr::parsing::or_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1222
#119 0x000055d3f3381640 in syn::expr::parsing::range_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:83
#120 0x000055d3f3380409 in syn::expr::parsing::placement_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:83
#121 0x000055d3f337e757 in syn::expr::parsing::assign_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:83
#122 0x000055d3f337e600 in syn::expr::parsing::ambiguous_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1074
#123 0x000055d3f3284333 in syn::expr::parsing::<impl syn::synom::Synom for syn::expr::Expr>::parse (i=...)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:69
#124 0x000055d3f33afc4c in syn::expr::parsing::stmt_expr (i=...) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:69
#125 0x000055d3f3299a69 in syn::expr::parsing::<impl syn::synom::Synom for syn::expr::Stmt>::parse (i=...)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:69
#126 0x000055d3f329717b in syn::expr::parsing::<impl syn::expr::Block>::parse_within (i=...) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:75
#127 0x000055d3f33aae65 in syn::expr::parsing::<impl syn::synom::Synom for syn::expr::Block>::parse::{{closure}} (i=...)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:2309
#128 0x000055d3f3327702 in syn::token::parsing::delim (delim=..., tokens=..., new=0x55d3f32e4c60 <syn::token::Brace>, f=...)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/token.rs:764
#129 0x000055d3f32e4ace in syn::token::Brace::parse (tokens=..., f=...) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/token.rs:324
#130 0x000055d3f3296685 in syn::expr::parsing::<impl syn::synom::Synom for syn::expr::Block>::parse (i=...)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:69
#131 0x000055d3f32959b5 in syn::expr::parsing::<impl syn::synom::Synom for syn::expr::ExprBlock>::parse (i=...)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:69
#132 0x000055d3f339e9d4 in syn::expr::parsing::expr_nosemi (i=...) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:69
#133 0x000055d3f33aeeef in syn::expr::parsing::stmt_blockexpr (i=...) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:69
#134 0x000055d3f329997b in syn::expr::parsing::<impl syn::synom::Synom for syn::expr::Stmt>::parse (i=...)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:69
#135 0x000055d3f329717b in syn::expr::parsing::<impl syn::expr::Block>::parse_within (i=...) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:75
#136 0x000055d3f33aae65 in syn::expr::parsing::<impl syn::synom::Synom for syn::expr::Block>::parse::{{closure}} (i=...)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:2309
#137 0x000055d3f3327702 in syn::token::parsing::delim (delim=..., tokens=..., new=0x55d3f32e4c60 <syn::token::Brace>, f=...)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/token.rs:764
#138 0x000055d3f32e4ace in syn::token::Brace::parse (tokens=..., f=...) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/token.rs:324
#139 0x000055d3f3296685 in syn::expr::parsing::<impl syn::synom::Synom for syn::expr::Block>::parse (i=...)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:69
#140 0x000055d3f32959b5 in syn::expr::parsing::<impl syn::synom::Synom for syn::expr::ExprBlock>::parse (i=...)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:69
#141 0x000055d3f339e9d4 in syn::expr::parsing::expr_nosemi (i=...) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:69
#142 0x000055d3f328da88 in syn::expr::parsing::<impl syn::synom::Synom for syn::expr::Arm>::parse (i=...)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:69
#143 0x000055d3f32cd4aa in syn::parsers::many0 (input=..., f=0x55d3f328c860 <syn::expr::parsing::<impl syn::synom::Synom for syn::expr::Arm>::parse>)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:504
#144 0x000055d3f33a2a6c in syn::expr::parsing::<impl syn::synom::Synom for syn::expr::ExprMatch>::parse::{{closure}} (i=...)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:1417
#145 0x000055d3f3330592 in syn::token::parsing::delim (delim=..., tokens=..., new=0x55d3f32e4c60 <syn::token::Brace>, f=...)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/token.rs:764
#146 0x000055d3f32e476e in syn::token::Brace::parse (tokens=..., f=...) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/token.rs:324
#147 0x000055d3f328af3f in syn::expr::parsing::<impl syn::synom::Synom for syn::expr::ExprMatch>::parse (i=...)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:69
#148 0x000055d3f339e1d0 in syn::expr::parsing::expr_nosemi (i=...) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:69
#149 0x000055d3f33aeeef in syn::expr::parsing::stmt_blockexpr (i=...) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:69
#150 0x000055d3f329997b in syn::expr::parsing::<impl syn::synom::Synom for syn::expr::Stmt>::parse (i=...)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:69
#151 0x000055d3f329717b in syn::expr::parsing::<impl syn::expr::Block>::parse_within (i=...) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:75
#152 0x000055d3f33aae65 in syn::expr::parsing::<impl syn::synom::Synom for syn::expr::Block>::parse::{{closure}} (i=...)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:2309
#153 0x000055d3f3327702 in syn::token::parsing::delim (delim=..., tokens=..., new=0x55d3f32e4c60 <syn::token::Brace>, f=...)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/token.rs:764
#154 0x000055d3f32e4ace in syn::token::Brace::parse (tokens=..., f=...) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/token.rs:324
#155 0x000055d3f3296685 in syn::expr::parsing::<impl syn::synom::Synom for syn::expr::Block>::parse (i=...)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:69
#156 0x000055d3f32959b5 in syn::expr::parsing::<impl syn::synom::Synom for syn::expr::ExprBlock>::parse (i=...)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:69
#157 0x000055d3f339bfae in syn::expr::parsing::atom_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:83
#158 0x000055d3f339679f in syn::expr::parsing::trailer_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:83
#159 0x000055d3f3395ffd in syn::expr::parsing::unary_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:83
#160 0x000055d3f33929af in syn::expr::parsing::cast_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:83
#161 0x000055d3f3390ec9 in syn::expr::parsing::term_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1315
#162 0x000055d3f338f549 in syn::expr::parsing::arith_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1302
#163 0x000055d3f338dbc9 in syn::expr::parsing::shift_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1290
#164 0x000055d3f338be09 in syn::expr::parsing::bitand_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1279
#165 0x000055d3f338a2d1 in syn::expr::parsing::bitxor_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1269
#166 0x000055d3f3388509 in syn::expr::parsing::bitor_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1262
#167 0x000055d3f33861b7 in syn::expr::parsing::compare_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1236
#168 0x000055d3f33848d9 in syn::expr::parsing::and_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1225
#169 0x000055d3f3383019 in syn::expr::parsing::or_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1222
#170 0x000055d3f3381640 in syn::expr::parsing::range_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:83
#171 0x000055d3f3380409 in syn::expr::parsing::placement_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:83
#172 0x000055d3f337e757 in syn::expr::parsing::assign_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:83
#173 0x000055d3f337e600 in syn::expr::parsing::ambiguous_expr (i=..., allow_struct=true, allow_block=true)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/expr.rs:1074
#174 0x000055d3f3284333 in syn::expr::parsing::<impl syn::synom::Synom for syn::expr::Expr>::parse (i=...)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/parsers.rs:69
#175 0x000055d3f317d095 in core::ops::function::FnOnce::call_once () at /checkout/src/libcore/ops/function.rs:223
#176 0x000055d3f3220130 in <F as syn::synom::Parser>::parse2 (self=0xa0, tokens=...) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/synom.rs:260
#177 0x000055d3f31f28de in syn::parse2 (tokens=...) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/lib.rs:621
#178 0x000055d3f31f072b in build_script_build::match_byte::expand_match_byte (body=0x7f762d06a100) at build/match_byte.rs:149
#179 0x000055d3f31f115f in <build_script_build::match_byte::MatchByteParser as syn::gen::fold::Fold>::fold_stmt (self=0x7f762d071d30, stmt=...) at build/match_byte.rs:157
#180 0x000055d3f31f5d91 in syn::gen::fold::fold_block::{{closure}} (it=...) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/gen/fold.rs:708
#181 0x000055d3f321ddf8 in core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &'a mut F>::call_once (self=0x7f762d06a9d0, args=...)
    at /checkout/src/libcore/ops/function.rs:271
#182 0x000055d3f31e44f4 in <core::option::Option<T>>::map (self=..., f=0x7f762d06a9d0) at /checkout/src/libcore/option.rs:404
#183 0x000055d3f319e1d6 in <core::iter::Map<I, F> as core::iter::iterator::Iterator>::next (self=0x7f762d06a9b0) at /checkout/src/libcore/iter/mod.rs:1347
#184 0x000055d3f315af13 in <alloc::vec::Vec<T> as alloc::vec::SpecExtend<T, I>>::spec_extend (self=0x7f762d06afb8, iterator=...) at /checkout/src/liballoc/vec.rs:1883
#185 0x000055d3f317984f in <alloc::vec::Vec<T> as alloc::vec::SpecExtend<T, I>>::from_iter (iterator=...) at /checkout/src/liballoc/vec.rs:1866
#186 0x000055d3f317aeda in <alloc::vec::Vec<T> as core::iter::traits::FromIterator<T>>::from_iter (iter=...) at /checkout/src/liballoc/vec.rs:1752
#187 0x000055d3f319a30a in core::iter::iterator::Iterator::collect (self=...) at /checkout/src/libcore/iter/iterator.rs:1375
#188 0x000055d3f31535f9 in <alloc::vec::Vec<T> as syn::gen::helper::fold::FoldHelper>::lift (self=..., f=...)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/gen/../gen_helper.rs:28
#189 0x000055d3f31f5cce in syn::gen::fold::fold_block (_visitor=0x7f762d071d30, _i=...) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/gen/fold.rs:708
#190 0x000055d3f3192c3c in syn::gen::fold::Fold::fold_block (self=0x7f762d071d30, i=...) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/gen/fold.rs:61
#191 0x000055d3f32025d4 in syn::gen::fold::fold_expr_while (_visitor=0x7f762d071d30, _i=...) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/gen/fold.rs:1335
#192 0x000055d3f3194638 in syn::gen::fold::Fold::fold_expr_while (self=0x7f762d071d30, i=...) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/gen/fold.rs:153
#193 0x000055d3f3216485 in syn::gen::fold::fold_expr (_visitor=0x7f762d071d30, _i=...) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/gen/fold.rs:855
#194 0x000055d3f31f139d in <build_script_build::match_byte::MatchByteParser as syn::gen::fold::Fold>::fold_expr (self=0x7f762d071d30, expr=...) at build/match_byte.rs:176
#195 0x000055d3f321a862 in syn::gen::fold::fold_stmt (_visitor=0x7f762d071d30, _i=...) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/gen/fold.rs:2472
#196 0x000055d3f31f105c in <build_script_build::match_byte::MatchByteParser as syn::gen::fold::Fold>::fold_stmt (self=0x7f762d071d30, stmt=...) at build/match_byte.rs:163
#197 0x000055d3f31f5d91 in syn::gen::fold::fold_block::{{closure}} (it=...) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/gen/fold.rs:708
#198 0x000055d3f321ddf8 in core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &'a mut F>::call_once (self=0x7f762d06e640, args=...)
    at /checkout/src/libcore/ops/function.rs:271
#199 0x000055d3f31e44f4 in <core::option::Option<T>>::map (self=..., f=0x7f762d06e640) at /checkout/src/libcore/option.rs:404
#200 0x000055d3f319e1d6 in <core::iter::Map<I, F> as core::iter::iterator::Iterator>::next (self=0x7f762d06e620) at /checkout/src/libcore/iter/mod.rs:1347
#201 0x000055d3f315af13 in <alloc::vec::Vec<T> as alloc::vec::SpecExtend<T, I>>::spec_extend (self=0x7f762d06ec28, iterator=...) at /checkout/src/liballoc/vec.rs:1883
#202 0x000055d3f317984f in <alloc::vec::Vec<T> as alloc::vec::SpecExtend<T, I>>::from_iter (iterator=...) at /checkout/src/liballoc/vec.rs:1866
#203 0x000055d3f317aeda in <alloc::vec::Vec<T> as core::iter::traits::FromIterator<T>>::from_iter (iter=...) at /checkout/src/liballoc/vec.rs:1752
#204 0x000055d3f319a30a in core::iter::iterator::Iterator::collect (self=...) at /checkout/src/libcore/iter/iterator.rs:1375
#205 0x000055d3f31535f9 in <alloc::vec::Vec<T> as syn::gen::helper::fold::FoldHelper>::lift (self=..., f=...)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/gen/../gen_helper.rs:28
#206 0x000055d3f31f5cce in syn::gen::fold::fold_block (_visitor=0x7f762d071d30, _i=...) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/gen/fold.rs:708
#207 0x000055d3f3192c3c in syn::gen::fold::Fold::fold_block (self=0x7f762d071d30, i=...) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/gen/fold.rs:61
#208 0x000055d3f31f8958 in syn::gen::fold::fold_item_fn (_visitor=0x7f762d071d30, _i=...) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/gen/fold.rs:1825
#209 0x000055d3f319319b in syn::gen::fold::Fold::fold_item_fn (self=0x7f762d071d30, i=...) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/gen/fold.rs:219
#210 0x000055d3f32191a2 in syn::gen::fold::fold_item (_visitor=0x7f762d071d30, _i=...) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/gen/fold.rs:1714
#211 0x000055d3f3196bf9 in syn::gen::fold::Fold::fold_item (self=0x7f762d071d30, i=...) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/gen/fold.rs:211
#212 0x000055d3f3218c4f in syn::gen::fold::fold_file::{{closure}} (it=...) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/gen/fold.rs:1422
#213 0x000055d3f321e438 in core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &'a mut F>::call_once (self=0x7f762d0712c8, args=...)
    at /checkout/src/libcore/ops/function.rs:271
#214 0x000055d3f31dbbd4 in <core::option::Option<T>>::map (self=..., f=0x7f762d0712c8) at /checkout/src/libcore/option.rs:404
#215 0x000055d3f319ebb5 in <core::iter::Map<I, F> as core::iter::iterator::Iterator>::next (self=0x7f762d0712a8) at /checkout/src/libcore/iter/mod.rs:1347
#216 0x000055d3f3171343 in <alloc::vec::Vec<T> as alloc::vec::SpecExtend<T, I>>::spec_extend (self=0x7f762d071878, iterator=...) at /checkout/src/liballoc/vec.rs:1883
#217 0x000055d3f3174eff in <alloc::vec::Vec<T> as alloc::vec::SpecExtend<T, I>>::from_iter (iterator=...) at /checkout/src/liballoc/vec.rs:1866
#218 0x000055d3f317b87a in <alloc::vec::Vec<T> as core::iter::traits::FromIterator<T>>::from_iter (iter=...) at /checkout/src/liballoc/vec.rs:1752
#219 0x000055d3f3198dca in core::iter::iterator::Iterator::collect (self=...) at /checkout/src/libcore/iter/iterator.rs:1375
#220 0x000055d3f3151439 in <alloc::vec::Vec<T> as syn::gen::helper::fold::FoldHelper>::lift (self=..., f=...)
    at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/gen/../gen_helper.rs:28
#221 0x000055d3f3218a89 in syn::gen::fold::fold_file (_visitor=0x7f762d071d30, _i=...) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/gen/fold.rs:1422
#222 0x000055d3f3196b88 in syn::gen::fold::Fold::fold_file (self=0x7f762d071d30, i=...) at /home/emilio/.cargo/registry/src/github.com-1ecc6299db9ec823/syn-0.13.11/src/gen/fold.rs:171
#223 0x000055d3f31ed64a in build_script_build::match_byte::expand (from=0x7f7629e240a0, to=0x7f7629e2d000) at build/match_byte.rs:22
#224 0x000055d3f31a2bd1 in build_script_build::codegen::main::{{closure}} () at build.rs:41
#225 0x000055d3f31f2692 in std::sys_common::backtrace::__rust_begin_short_backtrace (f=...) at /checkout/src/libstd/sys_common/backtrace.rs:136
#226 0x000055d3f3136877 in std::thread::Builder::spawn::{{closure}}::{{closure}} () at /checkout/src/libstd/thread/mod.rs:409
#227 0x000055d3f31a2af4 in <std::panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once (self=..., _args=()) at /checkout/src/libstd/panic.rs:305
#228 0x000055d3f318de37 in std::panicking::try::do_call (data=0x7f762d072170 "\240@\342)v\177\000") at /checkout/src/libstd/panicking.rs:310
#229 0x00007f762c7fa0ca in __rust_maybe_catch_panic () at libpanic_unwind/lib.rs:105
#230 0x000055d3f318dd1f in std::panicking::try (f=...) at /checkout/src/libstd/panicking.rs:289
#231 0x000055d3f31a2b34 in std::panic::catch_unwind (f=...) at /checkout/src/libstd/panic.rs:374
#232 0x000055d3f3136666 in std::thread::Builder::spawn::{{closure}} () at /checkout/src/libstd/thread/mod.rs:408
#233 0x000055d3f31369a9 in <F as alloc::boxed::FnBox<A>>::call_box (self=0x7f7629e29040, args=()) at /checkout/src/liballoc/boxed.rs:638
#234 0x00007f762c7e8fcb in _$LT$alloc..boxed..Box$LT$alloc..boxed..FnBox$LT$A$C$$u20$Output$u3d$R$GT$$u20$$u2b$$u20$$u27$a$GT$$u20$as$u20$core..ops..function..FnOnce$LT$A$GT$$GT$::call_once::ha6d848c5cff6eb89 () at /checkout/src/liballoc/boxed.rs:648
#235 std::sys_common::thread::start_thread () at libstd/sys_common/thread.rs:24
#236 0x00007f762c7b40e6 in std::sys::unix::thread::Thread::new::thread_start () at libstd/sys/unix/thread.rs:90
#237 0x00007f762c542594 in start_thread () from /lib64/libpthread.so.0
#238 0x00007f762c05e00f in clone () from /lib64/libc.so.6

I've verified that the culprit is this match_byte! expansion:

https://github.com/servo/rust-cssparser/blob/ad39746d6b2efab00ac9b3126e89fb7e5a89392d/src/tokenizer.rs#L814

We should try to re-enable the feature sooner rather than later.
@emilio emilio mentioned this issue Jun 12, 2018
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emilio commented Jun 12, 2018

cc @Eijebong, did you ever figure out what was up with that? Given the stack I suspect just Syn's using a lot of stack due to lack of inlining but...

Also, no idea why the stack overflows would be intermittent.

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We never figured out what was going on, we set the stack size to 128MB in cssparser's build script and it didn't fix it...

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emilio commented Jun 12, 2018

So, what the hell, there's a main thread which is overflowing the stack, but the thread that runs syn is not the main thread. I wonder if it's cssparser-macros what's overflowing the stack?

@emilio emilio mentioned this issue Jun 12, 2018
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emilio commented Jun 12, 2018

Tried servo/rust-cssparser#224 on #21036 and looks it was green, so I'm moderately sure that is the root cause.

bors-servo pushed a commit to servo/rust-cssparser that referenced this issue Jun 12, 2018
Auto merge of #224 - servo:morestack, r=SimonSapin
527ad2a 
procedural-masquerade: Give more stack to procedural-masquerade macros.

This is a prospective fix for servo/servo#21038.

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nox commented Jun 13, 2018

This stacktrace looks quite bad to me, is it expected that syn produces call stacks that deep @dtolnay?

@dtolnay dtolnay mentioned this issue Jun 13, 2018
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dtolnay commented Jun 13, 2018

Thanks for the ping. It looks like this is a consequence of the way we handle precedence of different kinds of expressions. We should be able to do better. I filed dtolnay/syn#442 to follow up.

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