Merge pull request #1 from nim-lang/devel

upstream

1 files changed, 116 insertions, 0 deletions

diff --git a/tests/async/tasync_traceback.nim b/tests/async/tasync_traceback.nim
new file mode 100644
index 000000000..08f7e7317
--- /dev/null
+++ b/tests/async/tasync_traceback.nim
@@ -0,0 +1,116 @@
+discard """
+  exitcode: 0
+  disabled: "windows"
+  output: '''
+b failure
+Async traceback:
+  tasync_traceback.nim(97) tasync_traceback
+  asyncmacro.nim(395)      a
+  asyncmacro.nim(34)       a_continue
+    ## Resumes an async procedure
+  tasync_traceback.nim(95) aIter
+  asyncmacro.nim(395)      b
+  asyncmacro.nim(34)       b_continue
+    ## Resumes an async procedure
+  tasync_traceback.nim(92) bIter
+  #[
+    tasync_traceback.nim(97) tasync_traceback
+    asyncmacro.nim(395)      a
+    asyncmacro.nim(43)       a_continue
+      ## Resumes an async procedure
+    asyncfutures.nim(211)    callback=
+    asyncfutures.nim(190)    addCallback
+    asyncfutures.nim(53)     callSoon
+    asyncmacro.nim(34)       a_continue
+      ## Resumes an async procedure
+    asyncmacro.nim(0)        aIter
+    asyncfutures.nim(304)    read
+  ]#
+Exception message: b failure
+Exception type:
+
+bar failure
+Async traceback:
+  tasync_traceback.nim(113) tasync_traceback
+  asyncdispatch.nim(1492)   waitFor
+  asyncdispatch.nim(1496)   poll
+    ## Processes asynchronous completion events
+  asyncdispatch.nim(1262)   runOnce
+  asyncdispatch.nim(183)    processPendingCallbacks
+    ## Executes pending callbacks
+  asyncmacro.nim(34)        bar_continue
+    ## Resumes an async procedure
+  tasync_traceback.nim(108) barIter
+  #[
+    tasync_traceback.nim(113) tasync_traceback
+    asyncdispatch.nim(1492)   waitFor
+    asyncdispatch.nim(1496)   poll
+      ## Processes asynchronous completion events
+    asyncdispatch.nim(1262)   runOnce
+    asyncdispatch.nim(183)    processPendingCallbacks
+      ## Executes pending callbacks
+    asyncmacro.nim(34)        foo_continue
+      ## Resumes an async procedure
+    asyncmacro.nim(0)         fooIter
+    asyncfutures.nim(304)     read
+  ]#
+Exception message: bar failure
+Exception type:'''
+"""
+import asyncdispatch
+
+# Tests to ensure our exception trace backs are friendly.
+
+# --- Simple test. ---
+#
+# What does this look like when it's synchronous?
+#
+# tasync_traceback.nim(23) tasync_traceback
+# tasync_traceback.nim(21) a
+# tasync_traceback.nim(18) b
+# Error: unhandled exception: b failure [OSError]
+#
+# Good (not quite ideal, but gotta work within constraints) traceback,
+# when exception is unhandled:
+#
+# <traceback for the unhandled exception>
+# <very much a bunch of noise>
+# <would be ideal to customise this>
+# <(the code responsible is in excpt:raiseExceptionAux)>
+# Error: unhandled exception: b failure
+# ===============
+# Async traceback
+# ===============
+#
+# tasync_traceback.nim(23) tasync_traceback
+#
+# tasync_traceback.nim(21) a
+# tasync_traceback.nim(18) b
+
+proc b(): Future[int] {.async.} =
+  if true:
+    raise newException(OSError, "b failure")
+
+proc a(): Future[int] {.async.} =
+  return await b()
+
+let aFut = a()
+try:
+  discard waitFor aFut
+except Exception as exc:
+  echo exc.msg
+echo()
+
+# From #6803
+proc bar(): Future[string] {.async.} =
+  await sleepAsync(100)
+  if true:
+    raise newException(OSError, "bar failure")
+
+proc foo(): Future[string] {.async.} = return await bar()
+
+try:
+  echo waitFor(foo())
+except Exception as exc:
+  echo exc.msg
+echo()
\ No newline at end of file