adding a block test and using PARAM_SPLAT to remove the last shift/reduce conflict

lib/coffee_script/grammar.y

@@ -5,7 +5,7 @@ token IF ELSE UNLESS
 token NUMBER STRING REGEX
 token TRUE FALSE YES NO ON OFF
 token IDENTIFIER PROPERTY_ACCESS
-token CODE PARAM NEW RETURN
+token CODE PARAM PARAM_SPLAT NEW RETURN
 token TRY CATCH FINALLY THROW
 token BREAK CONTINUE
 token FOR IN BY WHILE
@@ -17,12 +17,9 @@ token COMMENT
 token JS
 token INDENT OUTDENT
 
-# We expect one shift-reduce conflict. Because of the lexer, it will never occur.
-expect 1
-
 # Declare order of operations.
 prechigh
-  nonassoc UMINUS SPLAT NOT '!' '!!' '~' '++' '--' '?'
+  nonassoc UMINUS PARAM_SPLAT SPLAT NOT '!' '!!' '~' '++' '--' '?'
   left     '*' '/' '%'
   left     '+' '-'
   left     '<<' '>>' '>>>'
@@ -203,7 +200,7 @@ rule
 
   Param:
     PARAM
-  | '*' PARAM = SPLAT                 { result = ParamSplatNode.new(val[1]) }
+  | PARAM_SPLAT PARAM                 { result = ParamSplatNode.new(val[1]) }
   ;
 
   Splat:

lib/coffee_script/lexer.rb

@@ -219,7 +219,8 @@ module CoffeeScript
         i -= 1
         tok = @tokens[i]
         return if !tok
-        next if ['*', ','].include?(tok[0])
+        next if tok[0] == ','
+        next tok[0] = :PARAM_SPLAT if tok[0] == '*'
         return if tok[0] != :IDENTIFIER
         tok[0] = :PARAM
       end

test/fixtures/execution/test_blocks.coffee

@@ -0,0 +1,4 @@
+results: [1, 2, 3].map() x =>
+  x * x
+
+print(results.join(' ') is '1 4 9')