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We try to avoid using `select()` when we use `[0]` to access the first value of multiple returns (e.g. `multiCall()[0]`) In that case, we used to simply omit the `select()`. Unfortunately, this only works if the value is assigned directly (`local x = multiCall()`). In cases where the value is not assigned, omitting the select and keeping the original expression (`multiCall()`) will lead to all return values being passed on. (See #1411) To fix this, we now wrap the multireturncall in parentheses. using a new Lua parentheses expression. Using parenthesis is the correct way to keep only the first value of multiple returns (see https://www.lua.org/manual/5.1/manual.html#2.5) This fixes #1411
Perryvw
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Apr 12, 2023
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Using parentheses is a nice tidy way to do this!
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We try to avoid using
select()when we use[0]to access the first value of multiple returns (e.g.multiCall()[0]). In that case, we omit theselect(). Unfortunately, this only works if the value is assigned directly (local x = multiCall()). In cases where the value is not assigned, omitting the select and keeping just the call expression (multiCall()) will lead to all return values being passed on. (See #1411)To fix this, we now wrap the call in parentheses using a new Lua parentheses expression. Using parentheses is the correct way to keep only the first value of multiple returns (see https://www.lua.org/manual/5.1/manual.html#2.5)
TL;DR:
multiCall()[0]used to transpile tomultiCall()now it transpiles to(multiCall())which ensures correct semantics across all potential usages.This fixes #1411