C++ PATCH for c++/49867 (ICE with case label in lambda)

[Jason Merrill <jason at redhat dot com>]

When we enter a local class, including a lambda, we are no longer in the 
scope of any enclosing loops or switches, and we should adjust the 
parser state accordingly.

Tested x86_64-pc-linux-gnu, applying to trunk.
commit 72900624cbb7b7ded0deb615c5175fe34531914a
Author: Jason Merrill <jason@redhat.com>
Date:   Fri Jul 29 15:22:27 2011 -0700

    	PR c++/49867
    	* parser.c (cp_parser_lambda_expression): Also clear in_statement
    	and in_switch_statement_p.
    	(cp_parser_class_specifier): Likewise.

diff --git a/gcc/cp/parser.c b/gcc/cp/parser.c
index b7410d5..3828ca9 100644
--- a/gcc/cp/parser.c
+++ b/gcc/cp/parser.c
@@ -7437,8 +7437,12 @@ cp_parser_lambda_expression (cp_parser* parser)
     /* Inside the class, surrounding template-parameter-lists do not apply.  */
     unsigned int saved_num_template_parameter_lists
         = parser->num_template_parameter_lists;
+    unsigned char in_statement = parser->in_statement;
+    bool in_switch_statement_p = parser->in_switch_statement_p;
 
     parser->num_template_parameter_lists = 0;
+    parser->in_statement = 0;
+    parser->in_switch_statement_p = false;
 
     /* By virtue of defining a local class, a lambda expression has access to
        the private variables of enclosing classes.  */
@@ -7471,6 +7475,8 @@ cp_parser_lambda_expression (cp_parser* parser)
     type = finish_struct (type, /*attributes=*/NULL_TREE);
 
     parser->num_template_parameter_lists = saved_num_template_parameter_lists;
+    parser->in_statement = in_statement;
+    parser->in_switch_statement_p = in_switch_statement_p;
   }
 
   pop_deferring_access_checks ();
@@ -17007,6 +17013,8 @@ cp_parser_class_specifier_1 (cp_parser* parser)
   bool nested_name_specifier_p;
   unsigned saved_num_template_parameter_lists;
   bool saved_in_function_body;
+  unsigned char in_statement;
+  bool in_switch_statement_p;
   bool saved_in_unbraced_linkage_specification_p;
   tree old_scope = NULL_TREE;
   tree scope = NULL_TREE;
@@ -17060,6 +17068,12 @@ cp_parser_class_specifier_1 (cp_parser* parser)
   /* We are not in a function body.  */
   saved_in_function_body = parser->in_function_body;
   parser->in_function_body = false;
+  /* Or in a loop.  */
+  in_statement = parser->in_statement;
+  parser->in_statement = 0;
+  /* Or in a switch.  */
+  in_switch_statement_p = parser->in_switch_statement_p;
+  parser->in_switch_statement_p = false;
   /* We are not immediately inside an extern "lang" block.  */
   saved_in_unbraced_linkage_specification_p
     = parser->in_unbraced_linkage_specification_p;
@@ -17254,6 +17268,8 @@ cp_parser_class_specifier_1 (cp_parser* parser)
   pop_deferring_access_checks ();
 
   /* Restore saved state.  */
+  parser->in_switch_statement_p = in_switch_statement_p;
+  parser->in_statement = in_statement;
   parser->in_function_body = saved_in_function_body;
   parser->num_template_parameter_lists
     = saved_num_template_parameter_lists;
diff --git a/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-switch.C b/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-switch.C
new file mode 100644
index 0000000..c306771
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-switch.C
@@ -0,0 +1,26 @@
+// PR c++/49867
+// { dg-options -std=c++0x }
+
+int
+main ()
+{
+  void (*l)();
+  while (true)
+    {
+      switch (3)
+	{
+	  struct A {
+	    void f()
+	    {
+	    case 4:		// { dg-error "case" }
+	      break;		// { dg-error "break" }
+	    }
+	  };
+	  l = []()
+	    {
+	    case 3:		// { dg-error "case" }
+	      break;		// { dg-error "break" }
+	    };
+	}
+    }
+}