blob: 3e0c3903eac4e9fe119431ed0e2d9292a9565cc7 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
|
discard """
file: "tawaitsemantics.nim"
exitcode: 0
output: '''
Error caught
Test infix
Test call
'''
"""
import asyncdispatch
# This tests the behaviour of 'await' under different circumstances.
# For example, when awaiting Future variable and this future has failed the
# exception shouldn't be raised as described here
# https://github.com/nim-lang/Nim/issues/4170
proc thrower(): Future[void] =
result = newFuture[void]()
result.fail(newException(Exception, "Test"))
proc dummy: Future[void] =
result = newFuture[void]()
result.complete()
proc testInfix() {.async.} =
# Test the infix operator semantics.
var fut = thrower()
var fut2 = dummy()
await fut or fut2 # Shouldn't raise.
# TODO: what about: await thrower() or fut2?
proc testCall() {.async.} =
await thrower()
proc tester() {.async.} =
# Test that we can handle exceptions without 'try'
var fut = thrower()
doAssert fut.finished
doAssert fut.failed
doAssert fut.error.msg == "Test"
await fut # We are awaiting a 'Future', so no `read` occurs.
doAssert fut.finished
doAssert fut.failed
doAssert fut.error.msg == "Test"
echo("Error caught")
fut = testInfix()
await fut
doAssert fut.finished
doAssert(not fut.failed)
echo("Test infix")
fut = testCall()
await fut
doAssert fut.failed
echo("Test call")
waitFor(tester())
|