As far as I know you can't call a macro inside another macro. It doen't make
sense anyway.
Use a compiletime proc.
import macros
proc genVar(c: string): NimNode {.compiletime.} =
# {.compiletime.} pragma is automatically inferred if one of its argument
is of type NimNode.
result = newNimNode(nnkStmtList)
var
#section = newNimNode(nnkConstSection)
section = newNimNode(nnkVarSection)
constDef = newNimNode(nnkIdentDefs)
constDef.add(newIdentNode("myvar"))
constDef.add(newEmptyNode())
constDef.add(newIdentNode("C" & $c))
section.add(constDef)
result.add(section)
const CX = 7
macro t(s: string): typed =
var hhh = "X"
#genVar("X")
genVar($s) # this return a NimNode
# echo myVar + 1 # this makes no sense inside a macro
# NimNode are not variable in the traditional sense.
t("X")
echo myVar + 1 # this works
