[PATCH] c++: don't ICE on NAMESPACE_DECL inside FUNCTION_DECL

[Matthias Kretz <m.kretz@gsi.de>]

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OK for trunk? This fixes several modules.exp failures for me.

────────────────────── ✂ ──────────────────────

Code like
  void swap() {
    namespace __variant = __detail::__variant;
    ...
  }
create a NAMESPACE_DECL where the CP_DECL_CONTEXT is a FUNCTION_DECL.
DECL_TEMPLATE_INFO fails on NAMESPACE_DECL and therefore must be handled
first in the assertion.

Signed-off-by: Matthias Kretz <m.kretz@gsi.de>

gcc/cp/ChangeLog:

	* module.cc (trees_out::get_merge_kind): NAMESPACE_DECLs also
	cannot have a DECL_TEMPLATE_INFO.
---
 gcc/cp/module.cc | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)


--
──────────────────────────────────────────────────────────────────────────
 Dr. Matthias Kretz                           https://mattkretz.github.io
 GSI Helmholtz Centre for Heavy Ion Research               https://gsi.de
 stdₓ::simd
──────────────────────────────────────────────────────────────────────────

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diff --git a/gcc/cp/module.cc b/gcc/cp/module.cc
index 3b1b5ca0ac0..2b5a32695d2 100644
--- a/gcc/cp/module.cc
+++ b/gcc/cp/module.cc
@@ -10067,9 +10067,10 @@ trees_out::get_merge_kind (tree decl, depset *dep)
       tree ctx = CP_DECL_CONTEXT (decl);
       if (TREE_CODE (ctx) == FUNCTION_DECL)
 	{
-	  /* USING_DECLs cannot have DECL_TEMPLATE_INFO -- this isn't
-	     permitting them to have one.   */
+	  /* USING_DECLs and NAMESPACE_DECLs cannot have DECL_TEMPLATE_INFO --
+	     this isn't permitting them to have one.   */
 	  gcc_checking_assert (TREE_CODE (decl) == USING_DECL
+			       || TREE_CODE (decl) == NAMESPACE_DECL
 			       || !DECL_LANG_SPECIFIC (decl)
 			       || !DECL_TEMPLATE_INFO (decl));