When parsing function parameters containing a struct declaration,
initially auto_is_implicit_function_template_parm_p is set to true by
cp_parser_parameter_declaration_clause. However, later when we enter
class scope and scope_kind becomes sk_class, we don't set it to false, so
cp_parser_simple_type_specifier will call
synthesize_implicit_template_parm, which expects that
current_binding_level->kind == sk_function_parms, triggering a failed
assertion. This fix ensures that auto_is_implicit_function_template_parm_p
isn't set when parsing a struct body definition.
gcc/cp/ChangeLog:
PR c++/122112
* parser.cc (cp_parser_parameter_declaration_clause): Don't
enable auto_is_implicit_function_template_parm_p when entering
class scope.
gcc/testsuite/ChangeLog:
PR c++/122112
* g++.dg/parse/auto-struct-param.C: New test.
Signed-off-by: Egas Ribeiro <[email protected]>
---
gcc/cp/parser.cc | 8 +++++++-
gcc/testsuite/g++.dg/parse/auto-struct-param.C | 4 ++++
2 files changed, 11 insertions(+), 1 deletion(-)
create mode 100644 gcc/testsuite/g++.dg/parse/auto-struct-param.C
diff --git a/gcc/cp/parser.cc b/gcc/cp/parser.cc
index 8d1187f8cda..ccf5783de7f 100644
--- a/gcc/cp/parser.cc
+++ b/gcc/cp/parser.cc
@@ -28124,6 +28124,7 @@ cp_parser_class_specifier (cp_parser* parser)
bool in_switch_statement_p;
bool saved_in_unbraced_linkage_specification_p;
bool saved_in_unbraced_export_declaration_p;
+ bool saved_auto_is_implicit_function_template_parm_p;
tree old_scope = NULL_TREE;
tree scope = NULL_TREE;
cp_token *closing_brace;
@@ -28181,6 +28182,10 @@ cp_parser_class_specifier (cp_parser* parser)
saved_in_unbraced_export_declaration_p
= parser->in_unbraced_export_declaration_p;
parser->in_unbraced_export_declaration_p = false;
+ saved_auto_is_implicit_function_template_parm_p
+ = parser->auto_is_implicit_function_template_parm_p;
+ parser->auto_is_implicit_function_template_parm_p = false;
+
/* 'this' from an enclosing non-static member function is unavailable. */
tree saved_ccp = current_class_ptr;
tree saved_ccr = current_class_ref;
@@ -28571,9 +28576,10 @@ cp_parser_class_specifier (cp_parser* parser)
= saved_in_unbraced_linkage_specification_p;
parser->in_unbraced_export_declaration_p
= saved_in_unbraced_export_declaration_p;
+ parser->auto_is_implicit_function_template_parm_p
+ = saved_auto_is_implicit_function_template_parm_p;
current_class_ptr = saved_ccp;
current_class_ref = saved_ccr;
-
return type;
}
diff --git a/gcc/testsuite/g++.dg/parse/auto-struct-param.C
b/gcc/testsuite/g++.dg/parse/auto-struct-param.C
new file mode 100644
index 00000000000..78573c68503
--- /dev/null
+++ b/gcc/testsuite/g++.dg/parse/auto-struct-param.C
@@ -0,0 +1,4 @@
+// PR c++/122112
+// { dg-do compile { target c++20 } }
+
+void func(struct { auto x; }); // { dg-error "" }
--
2.51.0
