[Bug rust/32471] New: can't call is_some method

[Bug rust/32471] New: can't call is_some method

[tromey at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=32471

            Bug ID: 32471
           Summary: can't call is_some method
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: rust
          Assignee: unassigned at sourceware dot org
          Reporter: tromey at sourceware dot org
  Target Milestone: ---

This comes from:

https://github.com/rust-lang/rust/issues/33014#issuecomment-2390543267

Consider this program:

#![allow(dead_code)]
#![allow(unused_variables)]
#![allow(unused_assignments)]

fn empty () { }

fn main() {
    let a : Option<u32> = Some(23);
    let is = a.is_some();

    empty();
}


Compiling this with -g shows that the DWARF does have is_some:

 <3><438>: Abbrev Number: 22 (DW_TAG_structure_type)
    <439>   DW_AT_name        : (indirect string, offset: 0x31e): Option<u32>
[...]
 <4><499>: Abbrev Number: 24 (DW_TAG_subprogram)
    <49a>   DW_AT_linkage_name: (indirect string, offset: 0x2c0):
_ZN4core6option15Option$LT$T$GT$7is_some17h6eebf1fea383378fE
    <49e>   DW_AT_name        : (indirect string, offset: 0x2fd): is_some<u32>


However:

(gdb) p a.is_some()
Could not find function named 'core::option::Option<u32>::is_some'

Trying the name with parameters also fails:

(gdb) p a.is_some<u32>()
Attempting to access named field is_some of tuple variant
core::option::Option<u32>::Some, which has only anonymous fields


Perhaps relatedly, "p a.is_<TAB>" just beeps and does not complete.

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