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Clarify scoping with for loops.

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chriseth 2019-11-19 16:10:46 +01:00 committed by GitHub
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@ -182,11 +182,17 @@ introduce new identifiers into these scopes.
Identifiers are visible in Identifiers are visible in
the block they are defined in (including all sub-nodes and sub-blocks). the block they are defined in (including all sub-nodes and sub-blocks).
As an exception, identifiers defined in the "init" part of the for-loop
As an exception, identifiers defined directly in the "init" part of the for-loop
(the first block) are visible in all other parts of the for-loop (the first block) are visible in all other parts of the for-loop
(but not outside of the loop). (but not outside of the loop).
Identifiers declared in the other parts of the for loop respect the regular Identifiers declared in the other parts of the for loop respect the regular
syntactical scoping rules. syntactical scoping rules.
This means a for-loop of the form ``for { I... } C { P... } { B... }`` is equivalent
to ``{ I... for {} C { P... } { B... } }``.
The parameters and return parameters of functions are visible in the The parameters and return parameters of functions are visible in the
function body and their names cannot overlap. function body and their names cannot overlap.