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[backport] fix #11440, add docs to isNil for seq types needing nilseq (#13234) [ci skip]

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D-Nice 2020-01-23 01:51:53 -05:00 • committed by Miran
commit f12bea16ad
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lib/system.nim
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@ -1494,8 +1494,20 @@ else:
{.pragma: nilError.}
proc isNil*[T](x: seq[T]): bool {.noSideEffect, magic: "IsNil", nilError.}
## Requires `--nilseqs:on` since 0.19.
##
## Seqs are no longer nil by default, but set and empty.
## Check for zero length instead.
##
## See also:
## * `isNil(string) <#isNil,string>`_
proc isNil*[T](x: ref T): bool {.noSideEffect, magic: "IsNil".}
proc isNil*(x: string): bool {.noSideEffect, magic: "IsNil", nilError.}
## Requires `--nilseqs:on`.
##
## See also:
## * `isNil(seq[T]) <#isNil,seq[T][T]>`_
proc isNil*[T](x: ptr T): bool {.noSideEffect, magic: "IsNil".}
proc isNil*(x: pointer): bool {.noSideEffect, magic: "IsNil".}