[Bug rust/20165] New: bad completion interaction with expression parsing in rust

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

https://sourceware.org/bugzilla/show_bug.cgi?id=20165

            Bug ID: 20165
           Summary: bad completion interaction with expression parsing in
                    rust
           Product: gdb
           Version: unknown
            Status: NEW
          Severity: normal
          Priority: P2
         Component: rust
          Assignee: unassigned at sourceware dot org
          Reporter: tromey at sourceware dot org
  Target Milestone: ---

>From https://github.com/tromey/gdb/issues/35

Completion may give you a command line like:

ptype collections::vec::Vec<u8>

But this is a syntax error, it should be 

ptype collections::vec::Vec::<u8>

For this to work completion would have to be syntax-sensitive,
and we'd have to rewrite the symbol name to add the necessary "::".

On the other hand we would not want the "::" for

ptype something as collections::vec::Vec<u8>


One alternative approach would be to re-parse the expression
using "type" as the entry point.  (Ideally in this case we'd
only lex once, so it's a somewhat bigger change than might
be thought.)

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