symbol creates panic!

[fneddy]

this symbol will be parsed successfully, unwrap will work, but to_string() will panic!:

let x = cpp_demangle::Symbol::new("_Z18convertCase_helperIN14QUnicodeTables14CasefoldTraitsEtET0_S2_");
println!("{:?}",x);
let y = x.unwrap();
println!("{:?}",y);
let z = y.to_string();
println!("{:?}",z);

results in:

Ok(Symbol { raw: "_Z18convertCase_helperIN14QUnicodeTables14CasefoldTraitsEtET0_S2_", substitutions: SubstitutionTable {0: UnscopedTemplateName(UnscopedTemplateName(Unqualified(Source(SourceName(Identifier { start: 4, end: 22 }))))), 1: Prefix(Unqualified(Source(SourceName(Identifier { start: 26, end: 40 })))), 2: Prefix(Nested(BackReference(1), Source(SourceName(Identifier { start: 42, end: 56 })))), 3: Type(ClassEnum(Named(Nested(NestedName(CvQualifiers { restrict: false, volatile: false, const_: false }, None, BackReference(2)))))), 4: Type(TemplateParam(TemplateParam(1)))}, parsed: Encoding(Function(UnscopedTemplate(BackReference(0), TemplateArgs([Type(BackReference(3)), Type(Builtin(Standard(UnsignedShort)))])), BareFunctionType([BackReference(4), BackReference(3)]))) })
Symbol { raw: "_Z18convertCase_helperIN14QUnicodeTables14CasefoldTraitsEtET0_S2_", substitutions: SubstitutionTable {0: UnscopedTemplateName(UnscopedTemplateName(Unqualified(Source(SourceName(Identifier { start: 4, end: 22 }))))), 1: Prefix(Unqualified(Source(SourceName(Identifier { start: 26, end: 40 })))), 2: Prefix(Nested(BackReference(1), Source(SourceName(Identifier { start: 42, end: 56 })))), 3: Type(ClassEnum(Named(Nested(NestedName(CvQualifiers { restrict: false, volatile: false, const_: false }, None, BackReference(2)))))), 4: Type(TemplateParam(TemplateParam(1)))}, parsed: Encoding(Function(UnscopedTemplate(BackReference(0), TemplateArgs([Type(BackReference(3)), Type(Builtin(Standard(UnsignedShort)))])), BareFunctionType([BackReference(4), BackReference(3)]))) }
thread 'main' panicked at 'a Display implementation return an error unexpectedly: Error', /checkout/src/libcore/result.rs:860
stack backtrace:
   0: std::sys::imp::backtrace::tracing::imp::unwind_backtrace
             at /checkout/src/libstd/sys/unix/backtrace/tracing/gcc_s.rs:49
   1: std::sys_common::backtrace::_print
             at /checkout/src/libstd/sys_common/backtrace.rs:71
   2: std::panicking::default_hook::{{closure}}
             at /checkout/src/libstd/sys_common/backtrace.rs:60
             at /checkout/src/libstd/panicking.rs:355
   3: std::panicking::default_hook
             at /checkout/src/libstd/panicking.rs:371
   4: std::panicking::rust_panic_with_hook
             at /checkout/src/libstd/panicking.rs:549
   5: std::panicking::begin_panic
             at /checkout/src/libstd/panicking.rs:511
   6: std::panicking::begin_panic_fmt
             at /checkout/src/libstd/panicking.rs:495
   7: rust_begin_unwind
             at /checkout/src/libstd/panicking.rs:471
   8: core::panicking::panic_fmt
             at /checkout/src/libcore/panicking.rs:69
   9: core::result::unwrap_failed
             at /checkout/src/libcore/macros.rs:29
  10: <core::result::Result<T, E>>::expect
             at /checkout/src/libcore/result.rs:762
  11: <T as collections::string::ToString>::to_string
             at /checkout/src/libcollections/string.rs:2027
  12: cpp_test_demangle::main
             at src/main.rs:41
  13: __rust_maybe_catch_panic
             at /checkout/src/libpanic_unwind/lib.rs:98
  14: std::rt::lang_start
             at /checkout/src/libstd/panicking.rs:433
             at /checkout/src/libstd/panic.rs:361
             at /checkout/src/libstd/rt.rs:59
  15: main
  16: __libc_start_main
  17: _start

this symbol should be:

>> c++filt
_Z18convertCase_helperIN14QUnicodeTables14CasefoldTraitsEtET0_S2_
unsigned short convertCase_helper<QUnicodeTables::CasefoldTraits, unsigned short>(unsigned short)

[fitzgen]

Thanks for the bug report!

[fitzgen]

Fixed in 0.2.6