Typo in return before class construction crashes compiler

[endercrest]

Ran into a scenario where I had a typo in a return statement that caused the compiler to crash. Expected the code below to provide a useful error instead of crashing the compiler.

Code:

class Test {}

export function test() {
  retun new Test();
}

WebAssembly Studio: https://webassembly.studio/?f=8qsn9gum0sr

Error:

[info]: Task build is running...
[error]: Task build failed: assertion failed

[dcodeIO]

Taking a quick look, the problem is at

assemblyscript/src/parser.ts

Line 4398 in 250dc70

case Token.NEW:

where the new token is incorrectly handled as a non-starting token.