[Fixes #137] Improve reporting

2 files changed, 29 insertions, 0 deletions

diff --git a/test/racc/assets/ifelse.y b/test/racc/assets/ifelse.y
new file mode 100644
index 0000000000..18dbe4b1a7
--- /dev/null
+++ b/test/racc/assets/ifelse.y
@@ -0,0 +1,14 @@
+class C::Parser
+token tSOMETHING
+rule
+  statement
+    : tSOMETHING
+    | 'if' statement 'then' statement
+    | 'if' statement 'then' statement 'else' statement
+    ;
+
+  dummy
+    : tSOMETHING '+' tSOMETHING
+    | tSOMETHING '-' tSOMETHING
+    ;
+
diff --git a/test/racc/test_racc_command.rb b/test/racc/test_racc_command.rb
index b4fc0c6745..f1116a371f 100644
--- a/test/racc/test_racc_command.rb
+++ b/test/racc/test_racc_command.rb
@@ -318,5 +318,20 @@ module Racc
       assert_debugfile 'tp_plus.y', [21, 0, 0, 0]
       assert_output_unchanged 'tp_plus.y'
     end
+
+    def test_ifelse
+      stderr = nil
+      racc "-o#{@TAB_DIR}/ifelse", "#{ASSET_DIR}/ifelse.y", stdout_filter: ->(s) { stderr = s }
+      stderr = stderr.lines[1..-1].join if RUBY_PLATFORM.match? /java/
+      assert_equal(<<~STDERR, stderr)
+        1 useless nonterminals:
+          dummy
+        2 useless rules:
+          #4 (dummy)
+          #5 (dummy)
+        1 shift/reduce conflicts
+        Turn on logging with "-v" and check ".output" file for details
+      STDERR
+    end
   end
 end