cannot convert int128 to type int64

[pgkos]

The following example fails to compile with a weird error:

Example

proc foo(t: typedesc[int64]) = discard

foo(int)

Current Output

bug.nim(3, 5) Error: cannot convert 170141183460469231731687303715884105727 to type int64

Expected Output

Either: first type mismatch at position: 1
or successful compilation.

Additional information

$ nim -v
Nim Compiler Version 0.20.99 [Linux: amd64]
Compiled at 2019-09-08
Copyright (c) 2006-2019 by Andreas Rumpf

active boot switches: -d:release

The bug affects the yaml package, the following example fails to compile:

import yaml

var a = 0
echo dump(a)