Disallowing Splats outside of ParamLists and ArgLists ... where they belong. This is in anticipation of the next commit...

lib/grammar.js

@@ -34,7 +34,7 @@
         return new LiteralNode($1);
       })
     ],
-    Expression: [o("Value"), o("Call"), o("Code"), o("Operation"), o("Assign"), o("If"), o("Try"), o("While"), o("For"), o("Switch"), o("Extends"), o("Class"), o("Splat"), o("Existence"), o("Comment")],
+    Expression: [o("Value"), o("Call"), o("Code"), o("Operation"), o("Assign"), o("If"), o("Try"), o("While"), o("For"), o("Switch"), o("Extends"), o("Class"), o("Existence"), o("Comment")],
     Block: [
       o("INDENT Body OUTDENT", function() {
         return $2;
@@ -317,16 +317,17 @@
     ArgList: [
       o("", function() {
         return [];
-      }), o("Expression", function() {
+      }), o("Arg", function() {
         return [$1];
-      }), o("ArgList , Expression", function() {
+      }), o("ArgList , Arg", function() {
         return $1.concat([$3]);
-      }), o("ArgList OptComma TERMINATOR Expression", function() {
+      }), o("ArgList OptComma TERMINATOR Arg", function() {
         return $1.concat([$4]);
       }), o("ArgList OptComma INDENT ArgList OptComma OUTDENT", function() {
         return $1.concat($4);
       })
     ],
+    Arg: [o("Expression"), o("Splat")],
     SimpleArgs: [
       o("Expression"), o("SimpleArgs , Expression", function() {
         return $1 instanceof Array ? $1.concat([$3]) : [$1].concat([$3]);