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fix #14404 foldr had the classic multiple evaluation bug (#14413)

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Timothee Cour 2020-05-21 02:01:43 -07:00 • committed by GitHub
commit 5caaa4bf6f
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1 changed files with 7 additions and 7 deletions
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14
lib/pure/collections/sequtils.nim
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@ -843,8 +843,7 @@ template foldl*(sequence, operation, first): untyped =
digits = foldl(numbers, a & (chr(b + ord('0'))), "")
assert digits == "0815"
var result: typeof(first)
result = first
var result: typeof(first) = first
for x in items(sequence):
let
a {.inject.} = result
@ -883,11 +882,11 @@ template foldr*(sequence, operation: untyped): untyped =
assert multiplication == 495, "Multiplication is (5*(9*(11)))"
assert concatenation == "nimiscool"
let s = sequence
assert s.len > 0, "Can't fold empty sequences"
var result: typeof(s[0])
result = sequence[s.len - 1]
for i in countdown(s.len - 2, 0):
let s = sequence # xxx inefficient, use {.evalonce.} pending #13750
let n = s.len
assert n > 0, "Can't fold empty sequences"
var result = s[n - 1]
for i in countdown(n - 2, 0):
let
a {.inject.} = s[i]
b {.inject.} = result
@ -1436,6 +1435,7 @@ when isMainModule:
assert subtraction == 7, "Subtraction is (5-(9-(11)))"
assert multiplication == 495, "Multiplication is (5*(9*(11)))"
assert concatenation == "nimiscool"
doAssert toSeq(1..3).foldr(a + b) == 6 # issue #14404
block: # mapIt + applyIt test
counter = 0