X::Proc::Async::OpenForWriting Reference

Error due to writing to a read-only Proc::Async object

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::OpenForWriting:D:)

Returns the method name that was called and which caused the exception.

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.

2 no-output · 1 rakupp-differs

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

my $proc = Proc::Async.new("echo");
$proc.start;
$proc.say(42);
CATCH { default { put .^name, ': ', .Str } };
# OUTPUT: «X::Proc::Async::OpenForWriting: Process must be opened for writing with :w to call 'say'␤»

X::Proc::Async::OpenForWriting: Process must be opened for writing with :w to call 'say'

X::Proc::Async::OpenForWriting: Process must be opened for writing with :w to call 'say'

my $prog = Proc::Async.new(:w, 'cat');
$prog.stdout.tap( -> $str {
    print $str;
});
my $promise = $prog.start;
await $prog.say('foo');
$prog.close-stdin;
await $promise;