Duplicate identifiers in function signature is considered valid code

[saulecabrera]

The following should not compile

function id<T>(a: T, a: T): T {
  return a;
}

export const a = id<i32>(1, 2);

Expected
Duplicate identifier 'a'

Actual
Compiles successfully.

[willemneal]

Out of curiosity what does it return?

[saulecabrera]

The last param will override any of the previous ones, in this case, it returns 2.