{.async.} pragma cannot be used for proc types

[leo-cydar]

Description

The {.async.} pragma cannot be used in conjunction with the proc type. This is unlike other pragmas such as {.gcsafe.} or {.locks.}.

Repro

type Route = tuple[path: Regex, handler: proc(req:Request) {.async.}]
===
"attempting to call undeclared routine: 'async'"

Workaround

Declare proc as having return type Future[T]. Doesn't looks like this then accurately represents the procedure, if it has {.async.} applied.

[Araq]

async is not a pragma, it is a macro.

Workaround:

type Route = tuple[path: Regex, handler: proc(req:Request): Future[void]]