Paul Rubin no.email at nospam.invalid
Sun Mar 27 02:34:11 EDT 2016

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BartC <bc at freeuk.com> writes:
>  But my suggestion was to have required a keyword in front of
> such expressions.

Should there be a keyword in front of a line containing "sqrt(x)" ?
What about "launch(missiles)" ?

The compiler can't tell which of those expressions has a side effect.
The first might be buggy code but the second is idiomatic.

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