Style

src/core.js

   '<': (a, b) => new AST.Boolean({ value: a.value < b.value }),
   '>=': (a, b) => new AST.Boolean({ value: a.value >= b.value }),
   '<=': (a, b) => new AST.Boolean({ value: a.value <= b.value }),
-  list: (...args) => {
-    return new AST.List({ elements: args })
-  },
+  list: (...args) => new AST.List({ elements: args }),
   length: xs => new AST.Number({ value: xs.elements.length }),
   cons: (x, xs) => new AST.List({ elements: [x, ...xs.elements] }),
   head: xs => xs.elements[0],