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Detail in the manual 

More precision describing the variables that won't be closed if a
coroutine yields forever.
This commit is contained in:
Roberto Ierusalimschy 2019-06-10 13:59:19 -03:00
parent f39e8c06d6
commit d2a9b4ffb8
1 changed files with 6 additions and 5 deletions
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11
manual/manual.of
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@ -1553,9 +1553,11 @@ interrupt the respective method,
but are otherwise ignored; but are otherwise ignored;
the error reported is the original one. the error reported is the original one.
If a coroutine yields inside a block and is never resumed again, If a coroutine yields and is never resumed again,
the variables visible at that block will never go out of scope, some variables may never go out of scope,
and therefore they will never be closed. and therefore they will never be closed.
(These variables are the ones created inside the coroutine
and in scope at the point where the coroutine yielded.)
Similarly, if a coroutine ends with an error, Similarly, if a coroutine ends with an error,
it does not unwind its stack, it does not unwind its stack,
so it does not close any variable. so it does not close any variable.
@ -2245,9 +2247,9 @@ Consider the following example:
@verbatim{ @verbatim{
a = {} a = {}
local x = 20 local x = 20
for i=1,10 do for i = 1, 10 do
local y = 0 local y = 0
a[i] = function () y=y+1; return x+y end a[i] = function () y = y + 1; return x + y end
end end
} }
The loop creates ten closures The loop creates ten closures
@ -6815,7 +6817,6 @@ A value of @true as a fourth, optional argument @id{plain}
turns off the pattern matching facilities, turns off the pattern matching facilities,
so the function does a plain @Q{find substring} operation, so the function does a plain @Q{find substring} operation,
with no characters in @id{pattern} being considered magic. with no characters in @id{pattern} being considered magic.
Note that if @id{plain} is given, then @id{init} must be given as well.
If the pattern has captures, If the pattern has captures,
then in a successful match then in a successful match