It works when the macro parameter is untyped, I guess constant folding happens
during the typing process:
import macros
macro mylog(x:untyped): untyped =
result = newNimNode(nnkStmtList, x)
result.add(newCall("write", newIdentNode("stdout"), toStrLit(x)))
result.add(newCall("write", newIdentNode("stdout"), newStrLitNode(":")))
result.add(newCall("writeLine", newIdentNode("stdout"), x))
var x=1
mylog(x+1) # x + 1:2 (OK but I'd rather want exact source code with
spacing eg: `x+1:2`)
mylog(1+1) # 2:2 (not OK, I want: 1+1: 2)
