fixing improperly-formatted-output of pattern matching within comprehension arguments.

lib/nodes.js

@@ -1476,7 +1476,7 @@
           namePart = new AssignNode(this.name, literal("" + svar + "[" + ivar + "]")).compile(merge(o, {
             indent: this.idt(1),
             top: true
-          })) + "\n";
+          })) + '\n';
         } else {
           if (name) {
             namePart = ("" + name + " = " + svar + "[" + ivar + "]");
@@ -1504,9 +1504,7 @@
         }
         body = ClosureNode.wrap(body, true);
       } else {
-        if (namePart) {
-          varPart = ("" + (this.idt(1)) + namePart + ";\n");
-        }
+        varPart = this.pattern ? namePart : ("" + (this.idt(1)) + namePart + ";\n");
       }
       this.object ? (forPart = ("" + ivar + " in " + svar + ") { if (" + (utility('hasProp')) + ".call(" + svar + ", " + ivar + ")")) : null;
       body = body.compile(merge(o, {

src/nodes.coffee

@@ -1247,7 +1247,7 @@ exports.ForNode: class ForNode extends BaseNode
       svar:         scope.freeVariable()
       sourcePart:   "$svar = ${ @source.compile(o) };"
       if @pattern
-        namePart:   new AssignNode(@name, literal("$svar[$ivar]")).compile(merge o, {indent: @idt(1), top: true}) + "\n"
+        namePart:   new AssignNode(@name, literal("$svar[$ivar]")).compile(merge o, {indent: @idt(1), top: true}) + '\n'
       else
         namePart:   "$name = $svar[$ivar]" if name
       unless @object
@@ -1266,7 +1266,7 @@ exports.ForNode: class ForNode extends BaseNode
       body.unshift  literal "var $index = $ivar" if index
       body:         ClosureNode.wrap(body, true)
     else
-      varPart:      "${@idt(1)}$namePart;\n" if namePart
+      varPart:      if @pattern then namePart else "${@idt(1)}$namePart;\n"
     if @object
       forPart:      "$ivar in $svar) { if (${utility('hasProp')}.call($svar, $ivar)"
     body:           body.compile(merge(o, {indent: @idt(1), top: true}))