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Workaround for Nim gensym bug #60

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Apr 20, 2024
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Workaround for Nim gensym bug #60

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6 changes: 4 additions & 2 deletions questionable/private/binderror.nim
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Original file line number Diff line number Diff line change
Expand Up @@ -11,15 +11,17 @@ macro captureBindError*(error: var ref CatchableError, expression): auto =

# name of the error variable as a string literal
let errorVariableName = newLit($error)

let evaluated = genSym(nskLet, "evaluated")
quote do:
# add error variable to the top of the stack
static: errorVariableNames.add(`errorVariableName`)
# evaluate the expression
let evaluated = `expression`
let `evaluated` = `expression`
# pop error variable from the stack
static: discard errorVariableNames.pop()
# return the evaluated result
evaluated
`evaluated`

func unsafeError[T](_: Option[T]): ref CatchableError =
newException(ValueError, "Option is set to `none`")
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