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Improve error message when a nil future is await'ed.

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This commit is contained in:
Dominik Picheta 2017-02-09 23:07:10 +01:00
commit 3286480985
1 changed files with 5 additions and 3 deletions
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8
lib/pure/asyncmacro.nim
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@ -33,8 +33,10 @@ template createCb(retFutureSym, iteratorNameSym,
if not nameIterVar.finished: if not nameIterVar.finished:
var next = nameIterVar() var next = nameIterVar()
if next == nil: if next == nil:
assert retFutureSym.finished, "Async procedure's (" & if not retFutureSym.finished:
name & ") return Future was not finished." let msg = "Async procedure ($1) yielded `nil`, are you await'ing a " &
"`nil` Future?"
raise newException(AssertionError, msg % name)
else: else:
next.callback = cb next.callback = cb
except: except:
@ -390,7 +392,7 @@ proc asyncSingleProc(prc: NimNode): NimNode {.compileTime.} =
if procBody.kind != nnkEmpty: if procBody.kind != nnkEmpty:
result[6] = outerProcBody result[6] = outerProcBody
#echo(treeRepr(result)) #echo(treeRepr(result))
#if prc[0].getName == "testInfix": #if prc[0].getName == "beta":
# echo(toStrLit(result)) # echo(toStrLit(result))
macro async*(prc: untyped): untyped = macro async*(prc: untyped): untyped =