include module ID in error message (#143)

src/Module.js

@@ -500,6 +500,7 @@ export default class Module {
 			} catch ( err ) {
 				err.code = 'PARSE_ERROR';
 				err.file = this.id; // see above - not necessarily true, but true enough
+				err.message += ` in ${this.id}`;
 				throw err;
 			}
 		}

test/function/reports-syntax-error-locations/_config.js

@@ -0,0 +1,8 @@
+var assert = require( 'assert' );
+
+module.exports = {
+	description: 'reports syntax error filename',
+	error: function ( err ) {
+		assert.ok( /in .+main\.js/.test( err.message ) );
+	}
+};

test/function/reports-syntax-error-locations/main.js

@@ -0,0 +1 @@
+var 42 = answer;