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fail
Combined from primary sources listed below.

In Control flow§

See primary documentation in context for fail

Leaves the current routine and returns the provided Exception or Str wrapped inside a Failure, after all relevant phasers are executed. If the caller activated fatal exceptions via the pragma use fatal;, the exception is thrown instead of being returned as a Failure.

sub f { fail "WELP!" };
say f;
CATCH { default { say .^name, ': ', .Str } }
# OUTPUT: «X::AdHoc: WELP!␤»