crash: upcall fail 'non-exhaustive match failure', ../src/comp/middle/resolve.rs:528

[elly]

Test case at http://www.leptoquark.net/~elly/ncurses-upcall.tar - run 'make' with RUSTC set to the path to rustc.

Stack:
(gdb) bt
#0 upcall_fail (task=0x8378c10, expr=0x82ef0d0 "non-exhaustive match failure",

file=0x82ef0f0 "../src/comp/middle/resolve.rs", line=528) at ../src/rt/rust_upcall.cpp:51

#1 0x08117a1e in middle::resolve::unresolved_err::find_fn_or_mod_scope::_11d8d7a1b3173afd ()
#2 0x08117aa5 in middle::resolve::unresolved_err::_8fe5692fa91c66e7 ()
#3 0x081172b7 in middle::resolve::resolve_import::_3354391b72ff8d30 ()
#4 0x0811c2ae in middle::resolve::lookup_import::_5f11611311b3f85d ()
#5 0x0811e4c7 in middle::resolve::lookup_in_mie::_1af2af89a4dbe2bf ()
#6 0x0811c9d7 in middle::resolve::lookup_in_local_mod::_3a417697f1fecd7e ()
#7 0x08118fa1 in middle::resolve::lookup_in_scope::in_scope::_d22cc8e3a19c1650 ()
#8 0x081198a0 in middle::resolve::lookup_in_scope::_65b0cba70c22e847 ()
#9 0x08118bbc in middle::resolve::lookup_in_scope_strict::_65b0cba70c22e847 ()
#10 0x08115c33 in middle::resolve::follow_import::_5c34ba815afeb3be ()
#11 0x08111f55 in middle::resolve::map_crate::link_glob::_323d45b84af19bac ()
#12 0x082ad217 in middle::resolve::map_crate::thunk2863 ()
#13 0x082c31fb in syntax::visit::default_visitor::thunk5554 ()
#14 0x08112a28 in middle::resolve::map_crate::_e28dd3e647304bf3 ()
#15 0x08111118 in middle::resolve::resolve_crate::_2151ce98ffc834dc ()
#16 0x082e12fd in driver::rustc::compile_input::thunk8520 ()
#17 0x0827370d in driver::rustc::time::_8bcb4789e2c2f57e ()
#18 0x08274cb4 in driver::rustc::compile_input::_9ebee06e8be09320 ()
#19 0x082817bc in driver::rustc::main::_ed54e060591e3a31 ()
#20 0x08281f53 in _rust_main ()
#21 0x082e4aac in _rust_main_wrap ()
#22 0xf6e86a21 in task_start_wrapper (a=0xf6be0010) at ../src/rt/rust_task.cpp:150
#23 0xdeadbeef in ?? ()
#24 0xf6be0010 in ?? ()
#25 0x00000000 in ?? ()

[brson]

The problem is in test.rs at `import ncurses::ncurses;'

[brson]

Possibly because ncurses is already in scope and we're trying to import something else called ncurses.

[marijnh]

Note that you still can't import like this. Whether this is something that the language should handle by magically using two meanings for 'ncurses' in the scope or not is a different issue. We're already doing something magical where we resolve 'import x::x' in the scope above the current scope (which was causing this error in the first place). This works in multi-module crates but not in single-mod files like this, since there is no outer scope to fall back to.