Here's an example:

Example

proc test(a: range[0..1]) = while true: {.computedGoto.} let b = int(a) * 2 case a  of 0: echo b break  of 1: echo b break test(1)

The reason for this is that in C code b is always redefined, for each individual case. This is the reason the value assigned to b during the previous iteration is lost.

Current Output

This can vary based on what's still in register/memory

42 

Expected Output

2 

Additional Information

Nim Compiler Version 1.1.1 [Windows: amd64] Compiled at 2019-11-29 Copyright (c) 2006-2019 by Andreas Rumpf git hash: c5c6bae2a42734df2ba5fdb7cd8cf327d4e7005f active boot switches: -d:release