started raising syntax errors for parens wrapped around expressions (they used to silently be ignored)

lib/coffee_script/command_line.rb

@@ -125,13 +125,13 @@ Usage:
     end
 
     # Compile a single source file to JavaScript.
-    def compile(script, source='')
+    def compile(script, source='error')
       begin
         options = {}
         options[:no_wrap] = true if @options[:no_wrap]
         CoffeeScript.compile(script, options)
-      rescue CoffeeScript::ParseError => e
+      rescue CoffeeScript::ParseError, SyntaxError => e
-        STDERR.puts e.message(source)
+        STDERR.puts "#{source}: #{e.message}"
         exit(1) unless @options[:watch]
         nil
       end

lib/coffee_script/nodes.rb

@@ -608,7 +608,9 @@ module CoffeeScript
     end
   end
 
-  # An extra set of parenthesis, supplied by the script source.
+  # An extra set of parentheses, supplied by the script source.
+  # You can't wrap parentheses around bits that get compiled into JS statements,
+  # unfortunately.
   class ParentheticalNode < Node
     attr_reader :expressions
 
@@ -617,7 +619,7 @@ module CoffeeScript
     end
 
     def statement?
-      @expressions.statement?
+      @expressions.unwrap.statement?
     end
 
     def custom_assign?
@@ -629,10 +631,11 @@ module CoffeeScript
     end
 
     def compile(o={})
+      raise SyntaxError, "parentheses can't be wrapped around a statement" if statement?
       o = super(o)
       compiled = @expressions.compile(o)
       compiled = compiled[0...-1] if compiled[-1..-1] == ';'
-      write(o[:no_paren] || statement? ? compiled : "(#{compiled})")
+      write(o[:no_paren] ? compiled : "(#{compiled})")
     end
   end
 

lib/coffee_script/parse_error.rb

@@ -9,9 +9,9 @@ module CoffeeScript
       @token_id, @value, @stack = token_id, value, stack
     end
 
-    def message(source_file=nil)
+    def message
       line      = @value.respond_to?(:line) ? @value.line : "END"
-      line_part = source_file ? "#{source_file}:#{line}:" : "line #{line}:"
+      line_part = "line #{line}:"
       id_part   = @token_id != @value.inspect ? ", unexpected #{@token_id.downcase}" : ""
       "#{line_part} syntax error for '#{@value.to_s}'#{id_part}"
     end

test/unit/test_parser.rb

@@ -77,4 +77,10 @@ class ParserTest < Test::Unit::TestCase
     assert nodes.compile(:no_wrap => true) == File.read('test/fixtures/generation/each_no_wrap.js')
   end
 
+  def test_no_wrapping_parens_around_statements
+    assert_raises(SyntaxError) do
+      @par.parse("(a: 1)").compile
+    end
+  end
+
 end