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quietly (statement prefix)
Combined from primary sources listed below.

In Statement prefixes§

See primary documentation in context for quietly

As a prefix, quietly suppresses all runtime warnings produced by the block or statement it precedes.

sub marine() {};
quietly say ~&marine; # OUTPUT: «marine␤»
sub told-you { warn 'hey...' };
quietly { told-you; warn 'kaput!' };
warn 'Telling you now!';  # OUTPUT: «Telling you now!␤ [...] ␤»

Calling .Str on code produces a warning. Preceding the code with quietly will just produce the output without warning.