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remove a special case in sigmatch; distinct pointer types no longer match nil type (#20251)

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* remove a special case in sigmatch; distinct pointer types no longer match `nil` type

* add tests

* fixes tests

* Update changelog.md

Co-authored-by: konsumlamm <44230978+konsumlamm@users.noreply.github.com>

Co-authored-by: Andreas Rumpf <rumpf_a@web.de>
Co-authored-by: konsumlamm <44230978+konsumlamm@users.noreply.github.com>
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ringabout 2022-08-24 01:27:20 +08:00 • committed by GitHub
commit 1182216381
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4 changed files with 30 additions and 15 deletions
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18
tests/distinct/tnil.nim
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@ -1,29 +1,21 @@
discard """
output: '''
1
0
0
'''
"""
{.experimental: "notnil".}
type
MyPointer = distinct pointer
MyString = distinct string
MyInt = distinct int
proc foo(a: MyPointer) =
proc foo(a: MyPointer): int =
# workaround a Windows 'repr' difference:
echo cast[int](a)
cast[int](a)
foo(cast[MyPointer](1))
foo(cast[MyPointer](nil))
foo(nil)
doAssert foo(cast[MyPointer](1)) == 1
doAssert foo(cast[MyPointer](nil)) == 0
doAssert foo(MyPointer(nil)) == 0
var p: MyPointer
p = cast[MyPointer](1)
p = cast[MyPointer](nil)
p = nil.MyPointer
p = nil
var i: MyInt
i = 1.MyInt