re PR c++/54764 (In class initialization of non-static lambda member can't be used in class with default template paramer)
PR c++/54764
PR c++/55972
* name-lookup.h (tag_scope): Add ts_lambda.
* semantics.c (begin_lambda_type): Use it.
* decl.c (xref_tag_1): Set CLASSTYPE_LAMBDA_EXPR.
* pt.c (check_default_tmpl_args): Ignore lambdas.
(push_template_decl_real): Handle lambdas.
* tree.c (no_linkage_check): Adjust lambda check.
From-SVN: r196742
