a68: remove redefined_keyword check and add test

This commit removes a spurious call to detect_redefined_keyword that
would emit confusing error messages.

Signed-off-by: Jose E. Marchesi <[email protected]>

gcc/algol68/ChangeLog

	* a68-parser-extract.cc (a68_extract_indicants): Do not
	detect_redefined_keyword for accessed modules.

gcc/testsuite/ChangeLog

	* algol68/compile/modules/program-error-multiple-delaration-module-1.a68:
	New test.

Author: jemarch

gcc/algol68/a68-parser-extract.cc

@@ -345,7 +345,6 @@ a68_extract_indicants (NODE_T *p)
 	      FORWARD (q);
 	      if (q != NO_NODE)
 		{
-		  detect_redefined_keyword (q, MODULE_DECLARATION);
 		  if (IS (q, BOLD_TAG))
 		    {
 		      extract_revelation (q, false /* is_public */);

gcc/testsuite/algol68/compile/modules/program-error-multiple-delaration-module-1.a68

@@ -0,0 +1,8 @@
+{ dg-modules "module10 module11 module12" }
+
+access Module10,
+       Module11,
+       Module11 { dg-error "multiple declaration.*bar" }
+begin assert (foo = 10);
+      assert (bar = 20)
+end