parse.y: duplicated when clause warning

* parse.y (case_args): moved "duplicated when clause" warning from
  compile phase, so that `ruby -wc` shows them.

1 files changed, 14 insertions, 3 deletions

diff --git a/test/ruby/test_syntax.rb b/test/ruby/test_syntax.rb
index 771764720b..ff8c62f6a1 100644
--- a/test/ruby/test_syntax.rb
+++ b/test/ruby/test_syntax.rb
@@ -515,8 +515,8 @@ WARN
   end
 
   def test_duplicated_when
-    w = 'warning: duplicated when clause is ignored'
-    assert_warning(/3: #{w}.+4: #{w}.+4: #{w}.+5: #{w}.+5: #{w}/m){
+    w = 'warning: duplicated `when\' clause with line 3 is ignored'
+    assert_warning(/3: #{w}.+4: #{w}.+4: #{w}.+5: #{w}.+5: #{w}/m) {
       eval %q{
         case 1
         when 1, 1
@@ -525,7 +525,7 @@ WARN
         end
       }
     }
-    assert_warning(/#{w}/){#/3: #{w}.+4: #{w}.+5: #{w}.+5: #{w}/m){
+    assert_warning(/#{w}/) {#/3: #{w}.+4: #{w}.+5: #{w}.+5: #{w}/m){
       a = a = 1
       eval %q{
         case 1
@@ -537,6 +537,17 @@ WARN
     }
   end
 
+  def test_duplicated_when_check_option
+    w = /duplicated `when\' clause with line 3 is ignored/
+    assert_in_out_err(%[-wc], "#{<<~"begin;"}\n#{<<~'end;'}", ["Syntax OK"], w)
+    begin;
+      case 1
+      when 1
+      when 1
+      end
+    end;
+  end
+
   def test_invalid_break
     assert_syntax_error("def m; break; end", /Invalid break/)
     assert_syntax_error('/#{break}/', /Invalid break/)