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nimcache/runnableExamples/asyncjs_examples_2.nim

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+#[
+autogenerated by docgen
+loc: /home/runner/work/Nim/Nim/lib/js/asyncjs.nim(249, 21)
+rdoccmd: -r:off
+]#
+import "/home/runner/work/Nim/Nim/lib/js/asyncjs.nim"
+{.line: ("/home/runner/work/Nim/Nim/lib/js/asyncjs.nim", 249, 21).}:
+  from std/sugar import `=>`
+  from std/strutils import contains
+
+  proc fn(n: int): Future[int] {.async.} =
+    if n >= 7: raise newException(ValueError, "foobar: " & $n)
+    else: result = n * 2
+
+  proc main() {.async.} =
+    var reason: Error
+    await fn(6).catch((r: Error) => (reason = r)) # note: `()` are needed, `=> reason = r` would not work
+    assert reason == nil
+    await fn(7).catch((r: Error) => (reason = r))
+    assert reason != nil
+    assert  "foobar: 7" in $reason.message
+
+  discard main()
+