Fail to demangle some symbols with v0 mangling syntax

[EFanZh]

Compile the following program with -Zsymbol-mangling-version=v0 flag:

fn main() {
    let _: Box<dyn Fn(&i32)> = Box::new(|_| {});
}

There are some symbols in the generated binary that start with _R but won’t demangle. Here is an example:

_RNvMs1_NtNtCs4RZURTQcbNt_4core3ptr6uniqueINtB5_6UniqueDG_INtNtNtB9_3ops8function2FnTRL0_lEEG_p6OutputuEL_E6as_refCs64Hs8MuYH5P_13mangled_names

After removing the second G_ substring, this one does demangle to <core[38bc23ee7739a169]::ptr::unique::Unique<dyn for<'a> core[38bc23ee7739a169]::ops::function::Fn<(&'a i32,), Output = ()>>>::as_ref:

_RNvMs1_NtNtCs4RZURTQcbNt_4core3ptr6uniqueINtB5_6UniqueDG_INtNtNtB9_3ops8function2FnTRL0_lEEp6OutputuEL_E6as_refCs64Hs8MuYH5P_13mangled_names

[EFanZh]

Maybe related: rust-lang/rust#83611.

[michaelwoerister]

Is this still an issue?

[EFanZh]

I think it is OK now.