[binutils-gdb/gdb-12-branch] Add Rust parser check for end of expression

[Tom Tromey <tromey@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=7685884a38572266216f12069e86f9c7fcdedc14

commit 7685884a38572266216f12069e86f9c7fcdedc14
Author: Tom Tromey <tom@tromey.com>
Date:   Thu Mar 17 22:36:12 2022 -0600

    Add Rust parser check for end of expression
    
    I noticed that "print 5," passed in Rust -- the parser wasn't checking
    that the entire input was used.  This patch fixes the problem.  This
    in turn pointed out another bug in the parser, namely that it didn't
    lex the next token after handling a string token.  This is also fixed
    here.

Diff:
---
 gdb/rust-parse.c                | 6 +++++-
 gdb/testsuite/gdb.rust/expr.exp | 2 ++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/gdb/rust-parse.c b/gdb/rust-parse.c
index 4006df7086b..7d7d882872c 100644
--- a/gdb/rust-parse.c
+++ b/gdb/rust-parse.c
@@ -271,7 +271,10 @@ struct rust_parser
   operation_up parse_entry_point ()
   {
     lex ();
-    return parse_expr ();
+    operation_up result = parse_expr ();
+    if (current_token != 0)
+      error (_("Syntax error near '%s'"), pstate->prev_lexptr);
+    return result;
   }
 
   operation_up parse_tuple ();
@@ -2020,6 +2023,7 @@ rust_parser::parse_atom (bool required)
 
     case STRING:
       result = parse_string ();
+      lex ();
       break;
 
     case BYTESTRING:
diff --git a/gdb/testsuite/gdb.rust/expr.exp b/gdb/testsuite/gdb.rust/expr.exp
index 0c445897338..bb0222bed4b 100644
--- a/gdb/testsuite/gdb.rust/expr.exp
+++ b/gdb/testsuite/gdb.rust/expr.exp
@@ -145,3 +145,5 @@ gdb_test "print 0x0 as fn(i64) -> ()" " = \\\(\\*mut fn \\\(i64\\\) -> \\\(\\\)\
 gdb_test "print r#" "No symbol 'r' in current context"
 
 gdb_test "printf \"%d %d\\n\", 23+1, 23-1" "24 22"
+
+gdb_test "print 5," "Syntax error near ','"