Re: Lua 5.4: question about label visibility rule
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- Subject: Re: Lua 5.4: question about label visibility rule
- From: Roberto Ierusalimschy <roberto@...>
- Date: 2022年1月19日 11:58:02 -0300
> In the Lua 5.4 docs it says the following.
>
> A label should not be declared where a label with the same
> name is visible, even if this other label has been declared
> in an enclosing block.
>
> I have found the following test in the Lua 5.4.3 Test Suite (available
> here: http://www.lua.org/tests/), in the file goto.lua (starting line
> 223):
>
> [...]
>
> In this function the label ::l1:: is declared twice, once in the
> "elseif a == 4" clause and once at the end of the function. In my
> understanding, the second declaration of this label is visible at the
> point where the first declaration is made. That would contravene the
> rule I have quoted above.
>
> This must mean that I am misunderstanding the meaning of the quoted
> rule. Could anyone please help me understand it?
REMEMBER: "The test suite is not a product; it is just a tool for our
internal use." (Third paragraph in http://www.lua.org/tests/)
-- Roberto