function shouldThrow(func, errorMessage) {
    var errorThrown = false;
    var error = null;
    try {
        func();
    } catch (e) {
        errorThrown = true;
        error = e;
    }
    if (!errorThrown)
        throw new Error('not thrown');
    if (String(error) !== errorMessage)
        throw new Error(`bad error: ${String(error)}`);
}

function checkModuleSyntaxError(source, errorMessage) {
    shouldThrow(() => checkModuleSyntax(source), errorMessage);
}

checkModuleSyntaxError(String.raw`
var await;
`, `SyntaxError: Cannot use 'await' as a variable name in a module.:2`);
checkModuleSyntaxError(`
export var await;
`, `SyntaxError: Cannot use 'await' as a variable name in a module.:2`);
checkModuleSyntaxError(String.raw`
let await;
`, `SyntaxError: Cannot use 'await' as a lexical variable name in a module.:2`);
checkModuleSyntaxError(String.raw`
export let await;
`, `SyntaxError: Cannot use 'await' as a lexical variable name in a module.:2`);
checkModuleSyntaxError(String.raw`
const await = 1
`, `SyntaxError: Cannot use 'await' as a lexical variable name in a module.:2`);
checkModuleSyntaxError(String.raw`
export const await = 1
`, `SyntaxError: Cannot use 'await' as a lexical variable name in a module.:2`);

checkModuleSyntaxError(String.raw`
function await() {}
`, `SyntaxError: Cannot declare function named 'await' in a module.:2`);
checkModuleSyntaxError(String.raw`
function* await() {}
`, `SyntaxError: Cannot declare function named 'await' in a module.:2`);
checkModuleSyntaxError(String.raw`
async function await() {}
`, `SyntaxError: Cannot declare function named 'await' in a module.:2`);

checkModuleSyntaxError(String.raw`
import {await} from 'foo';
`, `SyntaxError: Cannot use 'await' as an imported binding name.:2`);
checkModuleSyntaxError(String.raw`
import {foo as await} from 'foo';
`, `SyntaxError: Cannot use 'await' as an imported binding name.:2`);
checkModuleSyntaxError(String.raw`
import * as await from 'foo';
`, `SyntaxError: Cannot use 'await' as an imported binding name.:2`);
checkModuleSyntaxError(String.raw`
import await, {x, y, z} from 'foo';
`, `SyntaxError: Cannot use 'await' as an imported binding name.:2`);
checkModuleSyntaxError(String.raw`
import await, {x, y, z,} from 'foo';
`, `SyntaxError: Cannot use 'await' as an imported binding name.:2`);
checkModuleSyntaxError(String.raw`
import await from 'foo';
`, `SyntaxError: Cannot use 'await' as an imported binding name.:2`);
checkModuleSyntaxError(String.raw`
import await, * as foo from 'foo';
`, `SyntaxError: Cannot use 'await' as an imported binding name.:2`);