[Bug rust/26202] New: Support calling methods on types

["dxu at dxuuu dot xyz" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=26202

            Bug ID: 26202
           Summary: Support calling methods on types
           Product: gdb
           Version: HEAD
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: rust
          Assignee: unassigned at sourceware dot org
          Reporter: dxu at dxuuu dot xyz
  Target Milestone: ---

For example, calling `Vec::len()` fails:

Breakpoint 1, rust_debug::foo () at src/main.rs:2
2           let v = vec!(1,2,3);
(gdb) n
3           println!("{:?}", v);
(gdb) p v.len()
Could not find function named 'alloc::vec::Vec<i32>::len'

It works for vectors in C++:

Temporary breakpoint 1, main () at main.cpp:4
4       int main() {
(gdb) n
5         std::vector<int> v{1,2,3};
(gdb) n
6         for (int i : v) {
(gdb) p v.size()
$1 = 3

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