16 lines
347 B
Nim
16 lines
347 B
Nim
|
# Context
|
||
|
|
#
|
||
|
|
# Discussion with PMunch on IRC to disallow the use of some variable
|
||
|
|
# in a code block
|
||
|
|
|
||
|
|
template undef(symbol: untyped{nkIdent}, body: untyped{nkStmtList}): untyped =
|
||
|
|
block:
|
||
|
|
template `symbol`(): untyped = {.error: "Cannot use `" & astToStr(`symbol`) & "` in this undef context".}
|
||
|
|
body
|
||
|
|
|
||
|
|
var x = 100
|
||
|
|
echo x
|
||
|
|
|
||
|
|
undef(x):
|
||
|
|
echo x
|