The following code compiles (and runs) perfectly fine under 1.2.6 and 1.2.8 but fails compilation in 1.4.0
https://play.nim-lang.org/#ix=2BF4
import std/macros
template mk_discard*(macroName: untyped): untyped =
macro `macroName`(args: varargs[untyped]): untyped = discard
expandMacros:
mk_discard(foo)
foo(a,b,c,1, 2, 3)
Error message:
macro foo(args`gensym0: varargs[untyped]): untyped =
discard
/usercode/in.nim(6, 1) template/generic instantiation of `expandMacros` from here
/usercode/in.nim(7, 3) Error: illformed AST: macro foo(args`gensym0: varargs[untyped]): untyped =
discard