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function testSyntax(script) {
try {
eval(script);
} catch (error) {
if (error instanceof SyntaxError)
throw new Error("Bad error: " + String(error));
}
}
function testSyntaxError(script, message) {
var error = null;
try {
eval(script);
} catch (e) {
error = e;
}
if (!error)
throw new Error("Expected syntax error not thrown");
if (String(error) !== message)
throw new Error("Bad error: " + String(error));
}
{
let tokens = [
'-',
'+',
'~',
'!',
'typeof',
'void',
'delete',
];
for (let token of tokens) {
testSyntaxError(`
function pow(a, b)
{
return ${token} a ** b;
}
`, `SyntaxError: Unexpected token '**'. Ambiguous unary expression in the left hand side of the exponentiation expression; parentheses must be used to disambiguate the expression.`);
}
}
{
let tokens = [
'-',
'+',
'~',
'!',
'typeof',
'void',
'delete',
];
for (let token of tokens) {
testSyntax(`
function pow(a, b)
{
return (${token} a) ** b;
}
`);
}
}
{
let tokens = [
'++',
'--',
];
for (let token of tokens) {
testSyntax(`
function pow(a, b)
{
return ${token} a ** b;
}
`);
}
}
{
let tokens = [
'++',
'--',
];
for (let token of tokens) {
testSyntax(`
function pow(a, b)
{
return a ${token} ** b;
}
`);
}
}