Small bug-fixes and improvements

src/ir.ts

@@ -6,7 +6,7 @@ const builtin = ["number", "string", "boolean"];
 
 export class IRError extends Error {
    constructor(public statement: StatementNode, message: string) {
-      super("Error Compiling: " + message);
+      super("Error building IR: " + message);
    }
 }
 
@@ -198,7 +198,7 @@ export default function get_ir(parsed: Parsed): IR {
                   if (fnc.return_type.type !== "void" && builtin.indexOf(fnc.return_type.type) < 0) {
                      throw new IRError(
                         fnc,
-                        `Type ${fnc.return_type} is not defined`
+                        `Type ${fnc.return_type.type} is not defined`
                      );
                   }
                }