Rules / Types, classes & roles / exception

X::Proc::Async::MustBeStarted Reference

Error due to interacting with a Proc::Async stream before spawning its process

What it is #

Routines #

Signatures are reproduced from the documentation, including their declared return types. A routine listed here is part of the type's published interface; whether Raku++ implements it is a separate question, answered by the examples below.

method method #

method method(X::Proc::Async::MustBeStarted:D --> Str:D)

Returns Str:D.

Returns the name of the method that was illegally called before starting the external program.

Examples, run three ways #

Every example below comes from the official documentation, together with the output that documentation asserts. Each was then executed by Rakudo and by Raku++ when this page was built. Where the three agree, one result is shown; where they do not, all three are — because which of them is wrong is exactly the information worth having.

1 no-output · 1 rakupp-differs

class X::Proc::Async::MustBeStarted is Exception {}

Not executed: the documentation states no expected output for this example.

Proc::Async.new('echo', :w).say(42);
CATCH { default { put .^name, ': ', .Str } };
# OUTPUT: «X::Proc::Async::MustBeStarted: Process must be started first before calling 'say'␤»
Documentation
X::Proc::Async::MustBeStarted: Process must be started first before calling 'say'
Rakudo
X::Proc::Async::MustBeStarted: Process must be started first before calling 'say'
Raku++

Raku++ disagrees with both the documentation and Rakudo — a defect.