Remove direct error on macro rule count-related match failure

gcc/rust/ChangeLog:

	* expand/rust-macro-expand.cc
	(MacroExpander::match_repetition): Remove redundant rust_error_at call.

gcc/testsuite/ChangeLog:

	* rust/compile/macro6.rs: Remove check for direct error.
	* rust/compile/macro7.rs: Likewise.
	* rust/compile/macro-issue2229.rs: New test.

Signed-off-by: Owen Avery <[email protected]>

Author: powerboat9

gcc/rust/expand/rust-macro-expand.cc

@@ -694,13 +694,6 @@ MacroExpander::match_repetition (Parser<MacroInvocLexer> &parser,
       gcc_unreachable ();
     }
 
-  if (!res)
-    rust_error_at (rep.get_match_locus (),
-		   "invalid amount of matches for macro invocation. Expected "
-		   "between %s and %s, got %lu",
-		   lo_str.c_str (), hi_str.c_str (),
-		   (unsigned long) match_amount);
-
   rust_debug_loc (rep.get_match_locus (), "%s matched %lu times",
 		  res ? "successfully" : "unsuccessfully",
 		  (unsigned long) match_amount);

gcc/testsuite/rust/compile/macro-issue2229.rs

@@ -0,0 +1,6 @@
+macro_rules! foo {
+    ($(+)+) => {e};
+    () => {}
+}
+
+foo!();

gcc/testsuite/rust/compile/macro6.rs

@@ -1,5 +1,5 @@
 macro_rules! zero_or_one {
-    ($($a:literal)?) => { // { dg-error "invalid amount of matches for macro invocation. Expected between 0 and 1, got 2" }
+    ($($a:literal)?) => {
         f();
     }
 }

gcc/testsuite/rust/compile/macro7.rs

@@ -1,7 +1,7 @@
 fn f() {}
 
 macro_rules! one_or_more {
-    ($($a:literal)+) => { // { dg-error "invalid amount of matches for macro invocation" }
+    ($($a:literal)+) => {
         f();
     };
 }