[gcc r15-8359] gccrs: Avoid accidental insertion into map

[Arthur Cohen via Gcc-cvs]

https://gcc.gnu.org/g:2438584da1f8bbdfdc21b5a2a562472e0c572589

commit r15-8359-g2438584da1f8bbdfdc21b5a2a562472e0c572589
Author: Owen Avery <powerboat9.ga...@gmail.com>
Date:   Thu Sep 5 19:44:55 2024 -0400

    gccrs: Avoid accidental insertion into map
    
    gcc/rust/ChangeLog:
    
            * resolve/rust-ast-resolve-pattern.cc
            (PatternDeclaration::check_bindings_consistency): Check if
            outer_bindings_map contains an entry before indexing.
    
    Signed-off-by: Owen Avery <powerboat9.ga...@gmail.com>

Diff:
---
 gcc/rust/resolve/rust-ast-resolve-pattern.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/gcc/rust/resolve/rust-ast-resolve-pattern.cc 
b/gcc/rust/resolve/rust-ast-resolve-pattern.cc
index 9b383b722c87..ee84be8942bc 100644
--- a/gcc/rust/resolve/rust-ast-resolve-pattern.cc
+++ b/gcc/rust/resolve/rust-ast-resolve-pattern.cc
@@ -330,7 +330,8 @@ PatternDeclaration::check_bindings_consistency (
              if (!ident_is_outer_bound && !missing_bindings.count (ident))
                missing_bindings.insert ({ident, inner_info});
 
-             else if (outer_bindings_map[ident] != inner_info
+             else if (outer_bindings_map.count (ident)
+                      && outer_bindings_map[ident] != inner_info
                       && !inconsistent_bindings.count (ident))
                inconsistent_bindings.insert ({ident, inner_info});
            }