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sink parameter inference for types that have destructors (#13544)

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* ensure capitalize doesn't take an inferred sink parameter

* sink parameter inference: first version, for now disabled. Changed that sink parameters can be consumed multiple times in order to adhere to our spec.

* sink inference can now be disabled with .nosinks; sometimes for proc type interop this is required

* fixes yet another critical DFA bug

* better implementation that also understands if expressions etc

* document sink parameter inference and allow for global disabling
This commit is contained in:
Andreas Rumpf 2020-03-04 14:28:53 +01:00 • committed by GitHub
commit a0eca75182
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19 changed files with 158 additions and 28 deletions
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4
tests/destructor/tconsume_twice.nim
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@ -1,7 +1,7 @@
discard """
cmd: "nim c --newruntime $file"
errormsg: "sink parameter `a` is already consumed at tconsume_twice.nim(11, 10)"
line: 13
errormsg: "'=' 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