parse.y: !-operator warning

* parse.y (cond0): !-operator is a method call, no warning for
  literal in condition.  [ruby-core:77801] [Bug #12881]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56522 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 40 insertions, 0 deletions

diff --git a/test/ruby/test_syntax.rb b/test/ruby/test_syntax.rb
index 7c754316ff..ad1f0d8981 100644
--- a/test/ruby/test_syntax.rb
+++ b/test/ruby/test_syntax.rb
@@ -809,6 +809,46 @@ eom
     end
   end
 
+  def test_warning_literal_in_condition
+    assert_warn(/literal in condition/) do
+      eval('1 if ""')
+    end
+    assert_warn(/literal in condition/) do
+      eval('1 if //')
+    end
+    assert_warn(/literal in condition/) do
+      eval('1 if true..false')
+    end
+    assert_warning(/literal in condition/) do
+      eval('1 if 1')
+    end
+    assert_warning(/literal in condition/) do
+      eval('1 if :foo')
+    end
+    assert_warning(/literal in condition/) do
+      eval('1 if :"#{"foo".upcase}"')
+    end
+
+    assert_warn('') do
+      eval('1 if !""')
+    end
+    assert_warn('') do
+      eval('1 if !//')
+    end
+    assert_warn('') do
+      eval('1 if !(true..false)')
+    end
+    assert_warning('') do
+      eval('1 if !1')
+    end
+    assert_warning('') do
+      eval('1 if !:foo')
+    end
+    assert_warning('') do
+      eval('1 if !:"#{"foo".upcase}"')
+    end
+  end
+
   def test_alias_symbol
     bug8851 = '[ruby-dev:47681] [Bug #8851]'
     formats = ['%s', ":'%s'", ':"%s"', '%%s(%s)']