[Bug rust/21178] New: add xmethod support for rust

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

https://sourceware.org/bugzilla/show_bug.cgi?id=21178

            Bug ID: 21178
           Summary: add xmethod support for rust
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: rust
          Assignee: unassigned at sourceware dot org
          Reporter: tromey at sourceware dot org
  Target Milestone: ---

Currently it's difficult to get an individual element from
a Vec in Rust.  Example program:

fn main() {
    let x = vec!(1,2,3,4);
    println!("{}", x[2]);
}

(gdb) p x
$1 = Vec<i32>(len: 4, cap: 4) = {1, 2, 3, 4}
(gdb) p x[0]
Cannot subscript non-array type


Maybe xmethods or something similar could be added to the rust language code
in gdb.

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