Add failing test for nested mixins

src/moss.ts

 import Lexer, { LexerError } from './lexer';
 import Parser, { ParserError } from './parser';
 
-import { inspect } from 'util';
-const print = (obj: any) => {
-  console.log(inspect(obj, { depth: null }));
-};
+// import { inspect } from 'util';
+// const print = (obj: any) => {
+//   console.log(inspect(obj, { depth: null }));
+// };
 
 const rawArgs = minimist(process.argv.slice(2));
 
   } else {
     const parser = new Parser(tokens);
     const tree = parser.parse();
-    print(tree);
+    // print(tree);
     if (tree instanceof ParserError) {
       return tree;
     } else {

src/tests/compiler.test.ts

   const result = compile('(@mixin heading-color ($color) (h1 :color $color))(div (@heading-color blue))');
   t.equal(result, 'div h1{color:blue;}');
 });
+
+test('compiles nested mixins', (t) => {
+  t.plan(1);
+  const result = compile(`
+    (@mixin v-gutters ($v)
+      :margin-top $v
+      :margin-bottom $v)
+
+    (@mixin h-gutters ($h)
+      :margin-left $h
+      :margin-right $h)
+
+    (@mixin gutters ($v $h)
+      (@v-gutters $v)
+      (@h-gutters $h))
+
+    (.container
+      (@gutters 50px 100px))
+  `);
+  t.equal(result, '.container{margin-top:50px;margin-bottom:50px;margin-left:100px;margin-right:100px;}');
+});