LYR-PAR0051

a 'catch' clause on 'try?' or 'try!'

error · spec 06-errors

A try? or try! expression is followed by catch clauses.

Explanation

try? takes every error and gives null; try! takes every error and panics. Neither leaves an error for a clause to catch; the clauses belong to a plain try.

Write a plain try with the clauses, or drop the clauses.

Wrong

enum Oops :: [Error] { Bad; fn message(): string { return "oops"; } }

fn risky(): int throws Oops {
    return 1;
}

fn main(): void {
    let n = try! risky() catch (_) 0;
}

Right

enum Oops :: [Error] { Bad; fn message(): string { return "oops"; } }

fn risky(): int throws Oops {
    return 1;
}

fn main(): void {
    let n = try risky() catch (_) 0;
    let _ = n;
}