[Bug rust/22936] New: some tests fail with rustc 1.24

["tromey at sourceware dot org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=22936

            Bug ID: 22936
           Summary: some tests fail with rustc 1.24
           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: ---

rustc 1.24 causes some test failures in simple.exp and generics.exp.

For simple.exp the problem so far seems to be that the debuginfo changed.
Now rustc emits this for a rust enum member:

 <3><2c99>: Abbrev Number: 18 (DW_TAG_member)
    <2c9a>   DW_AT_type        : <0x2cc8>
    <2c9e>   DW_AT_byte_size   : 24
    <2c9f>   DW_AT_bit_size    : 8
    <2ca0>   DW_AT_bit_offset  : 56
    <2ca1>   DW_AT_data_member_location: 0x1ffffffffffffff0


Maybe the bit and byte sizes disagree because the data doesn't occupy the
full width?  DWARF seems to specify this behavior for base types but
that's the only rationale I could come up with.

Also the data member location seems incorrect.

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