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type PNode* = ref object of RootObj
template litNode (name, ty): stmt =
type name* = ref object of PNode
val*: ty
litNode PIntNode, int
import json
template withKey*(j: JsonNode; key: string; varname: expr;
body:stmt): stmt {.immediate.} =
if j.hasKey(key):
let varname{.inject.}= j[key]
block:
body
var j = parsejson("{\"zzz\":1}")
withkey(j, "foo", x):
echo(x)
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