line pragma

The line pragma can be used to affect line information of the annotated statement, as seen in stack backtraces:

template myassert*(cond: untyped, msg = "") =
  if not cond:
    # change run-time line information of the 'raise' statement:
    {.line: instantiationInfo().}:
      raise newException(AssertionDefect, msg)

If the line pragma is used with a parameter, the parameter needs to be a tuple[filename: string, line: int]. If it is used without a parameter, system.instantiationInfo() is used.