https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85292
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
On trunk we stopped emitting those symbols with r251433
Author: jason
Date: Tue Aug 29 20:37:15 2017 +0000
Reimplement handling of lambdas in templates.
* cp-tree.h (LAMBDA_FUNCTION_P): Check DECL_DECLARES_FUNCTION_P.
* decl.c (start_preparsed_function): Call start_lambda_scope.
(finish_function): Call finish_lambda_scope.
* init.c (get_nsdmi): Call start/finish_lambda_scope.
* lambda.c (start_lambda_scope): Only ignore VAR_DECL in a
function.
* parser.c (cp_parser_function_definition_after_declarator): Don't
call start/finish_lambda_scope.
* pt.c (retrieve_specialization): Ignore lambda functions in
templates.
(find_parameter_packs_r): Ignore capture proxies. Look into
lambdas.
(check_for_bare_parameter_packs): Allow bare packs in lambdas.
(tsubst_default_argument): Call start/finish_lambda_scope.
(tsubst_function_decl): Handle lambda functions differently.
(tsubst_template_decl): Likewise.
(tsubst_expr) [DECL_EXPR]: Skip closure declarations and capture
proxies.
(tsubst_lambda_expr): Create a new closure rather than instantiate
the one from the template.
(tsubst_copy_and_build): Don't register a specialization of a pack.
(regenerate_decl_from_template): Call start/finish_lambda_scope.
(instantiate_decl): Remove special lambda function handling.
* semantics.c (process_outer_var_ref): Remove special generic
lambda
handling. Don't implicitly capture in a lambda in a template.
Look
for an existing proxy.
* class.c (current_nonlambda_class_type): Use decl_type_context.
