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.error for routines now can also have a custom error message; improve error message for 'nil' strings

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This commit is contained in:
Araq 2018-09-25 00:28:39 +02:00
commit 548fc778c9
4 changed files with 33 additions and 15 deletions
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12
lib/system.nim
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@ -4112,8 +4112,16 @@ proc `==`*(x, y: cstring): bool {.magic: "EqCString", noSideEffect,
when defined(nimNoNilSeqs2):
when not compileOption("nilseqs"):
proc `==`*(x: string; y: type(nil)): bool {.error.} = discard
proc `==`*(x: type(nil); y: string): bool {.error.} = discard
when defined(nimHasUserErrors):
proc `==`*(x: string; y: type(nil)): bool {.
error: "'nil' is now invalid for 'string'; compile with --nilseqs:on for a migration period".} =
discard
proc `==`*(x: type(nil); y: string): bool {.
error: "'nil' is now invalid for 'string'; compile with --nilseqs:on for a migration period".} =
discard
else:
proc `==`*(x: string; y: type(nil)): bool {.error.} = discard
proc `==`*(x: type(nil); y: string): bool {.error.} = discard
template closureScope*(body: untyped): untyped =
## Useful when creating a closure in a loop to capture local loop variables by