# Does anyone know how I could check if a symbol exists in the current scope? The
# usecase is because I'm generating type definitions (as well as some additional
# boilerplate), and want to allow the user to use their own types, but with my
# macro signature `macro packet(protocolVersion: uint, packetName: untyped, body:
# untyped = nil)`, `body`'s `treeRepr` is this:```nim
# StmtList
#   Call
#     Ident "field1"
#     StmtList
#       Ident "uint"
#   Call
#     Ident "field2"
#     StmtList
#       BracketExpr
#         Ident "VarNum"
#         Ident "int32"
So I want to be able to check if `VarNum[int32]` is a valid type, for example