Allow newlines inside braced pattern

parse.y

@@ -3955,12 +3955,17 @@ p_expr_basic	: p_value
 			$$ = new_array_pattern_tail(p, Qnone, 0, 0, Qnone, &@$);
 			$$ = new_array_pattern(p, Qnone, Qnone, $$, &@$);
 		    }
-		| tLBRACE {$<tbl>$ = push_pktbl(p);} p_kwargs '}'
+		| tLBRACE
+		    {
+			$<tbl>$ = push_pktbl(p);
+			p->in_kwarg = 0;
+		    }
+		  p_kwargs rbrace
 		    {
 			pop_pktbl(p, $<tbl>2);
 			$$ = new_hash_pattern(p, Qnone, $3, &@$);
 		    }
-		| tLBRACE '}'
+		| tLBRACE rbrace
 		    {
 			$$ = new_hash_pattern_tail(p, Qnone, 0, &@$);
 			$$ = new_hash_pattern(p, Qnone, $$, &@$);
@@ -5420,6 +5425,9 @@ rparen		: opt_nl ')'
 rbracket	: opt_nl ']'
 		;
 
+rbrace		: opt_nl '}'
+		;
+
 trailer		: /* none */
 		| '\n'
 		| ','

test/ruby/test_pattern_matching.rb

@@ -1051,6 +1051,20 @@ END
       end
     end
 
+    assert_block do
+      case {a: 0}
+      in {a: 1
+      }
+        false
+      in {a:
+            2}
+        false
+      in {a:
+      }
+        true
+      end
+    end
+
     assert_syntax_error(%q{
       case _
       in "a-b":