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Control variables in for loops are read only

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This commit is contained in:
Roberto Ierusalimschy
2022-12-21 12:04:59 -03:00
parent 540d805226
commit b2f7b3b79f
5 changed files with 40 additions and 37 deletions
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10
testes/nextvar.lua
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@@ -609,10 +609,12 @@ do
a = 0; for i=1.0, 0.99999, -1 do a=a+1 end; assert(a==1)
end
do -- changing the control variable
local a
a = 0; for i = 1, 10 do a = a + 1; i = "x" end; assert(a == 10)
a = 0; for i = 10.0, 1, -1 do a = a + 1; i = "x" end; assert(a == 10)
do -- attempt to change the control variable
local st, msg = load "for i = 1, 10 do i = 10 end"
assert(not st and string.find(msg, "assign to const variable 'i'"))
local st, msg = load "for v, k in pairs{} do v = 10 end"
assert(not st and string.find(msg, "assign to const variable 'v'"))
end
-- conversion