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discardable async procs are now an error (#14176)

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* add discard warning in manual
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hlaaftana 2020-05-01 10:49:13 +03:00 • committed by GitHub
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doc/manual.rst
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@ -2568,7 +2568,8 @@ Example:
discard p(3, 4) # discard the return value of `p`
The ``discard`` statement evaluates its expression for side-effects and
throws the expression's resulting value away.
throws the expression's resulting value away, and should only be used
when ignoring this value is known not to cause problems.
Ignoring the return value of a procedure without using a discard statement is
a static error.