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discard """ | ||
file: "tawaitsemantics.nim" | ||
exitcode: 0 | ||
output: ''' | ||
Error caught | ||
Test infix | ||
Test call | ||
''' | ||
""" | ||
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import asyncdispatch | ||
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# 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 | ||
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proc thrower(): Future[void] = | ||
result = newFuture[void]() | ||
result.fail(newException(Exception, "Test")) | ||
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proc dummy: Future[void] = | ||
result = newFuture[void]() | ||
result.complete() | ||
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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? | ||
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proc testCall() {.async.} = | ||
await thrower() | ||
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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") | ||
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fut = testInfix() | ||
await fut | ||
doAssert fut.finished | ||
doAssert(not fut.failed) | ||
echo("Test infix") | ||
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fut = testCall() | ||
await fut | ||
doAssert fut.failed | ||
echo("Test call") | ||
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waitFor(tester()) |