Nim GoTo

This implements the goto statement of the Nim programming language.

The word label can be used to create a label, while goto or jmp can be used to jump to it.

Example

import goto

proc main =
  var i = 1
  label L1:
    echo i
    i += 1
  if i < 100:
    goto L1

main()

The word jmp can be used instead of goto. Their semantics are same.

import goto

proc main =
  var i = 1
  label L1:
    echo i
    inc i
  if i < 100:
    jmp L1

main()

How it works

As we know, Nim code can be compiled to C. Although Nim itself doesn't have goto, we can still put a label in the generated C code.

Note

• As this emits C code, it can only be used with the C-like backends.

• The Nim compiler also use labels in the C code. So please never use a label with one or more underscores (_) in the name, or the result is unpredictable.

• This is unstable.