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discard """
cmd: "nim c --newruntime $file"
errormsg: "'=copy' is not available for type <owned Foo>; requires a copy because it's not the last read of 'a'; another read is done here: tconsume_twice.nim(13, 10); routine: consumeTwice"
line: 11
"""
type
Foo = ref object
proc use(a: owned Foo): bool = discard
proc consumeTwice(a: owned Foo): owned Foo =
if use(a):
return
return a
assert consumeTwice(Foo()) != nil
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