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improve the 'has to be discarded' error message

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This commit is contained in:
Araq
2020-05-02 14:37:16 +02:00
committed by Andreas Rumpf
parent 87ac28d19a
commit 7f1d2489ad
5 changed files with 6 additions and 6 deletions
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4
compiler/semstmts.nim
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@@ -12,7 +12,7 @@
const
errNoSymbolToBorrowFromFound = "no symbol to borrow from found"
errDiscardValueX = "value of type '$1' has to be discarded"
errDiscardValueX = "value of type '$1' has to be used (or discarded)"
errInvalidDiscard = "statement returns no value that can be discarded"
errInvalidControlFlowX = "invalid control flow: $1"
errSelectorMustBeOfCertainTypes = "selector must be of an ordinal type, float or string"
@@ -144,7 +144,7 @@ proc discardCheck(c: PContext, result: PNode, flags: TExprFlags) =
var n = result
while n.kind in skipForDiscardable: n = n.lastSon
var s = "expression '" & $n & "' is of type '" &
result.typ.typeToString & "' and has to be discarded"
result.typ.typeToString & "' and has to be used (or discarded)"
if result.info.line != n.info.line or
result.info.fileIndex != n.info.fileIndex:
s.add "; start of expression here: " & c.config$result.info

2
tests/discard/tneedsdiscard.nim
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@@ -1,5 +1,5 @@
discard """
errormsg: '''expression 'open(f, "arg.txt", fmRead, -1)' is of type 'bool' and has to be discarded; start of expression here: tneedsdiscard.nim(7, 3)'''
errormsg: '''expression 'open(f, "arg.txt", fmRead, -1)' is of type 'bool' and has to be used (or discarded); start of expression here: tneedsdiscard.nim(7, 3)'''
line: 10
"""

2
tests/discard/tneedsdiscard_in_for.nim
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@@ -1,5 +1,5 @@
discard """
errormsg: '''expression 'premultiply(app.gradient[i])' is of type 'Rgba8' and has to be discarded'''
errormsg: '''expression 'premultiply(app.gradient[i])' is of type 'Rgba8' and has to be used (or discarded)'''
line: 22
"""

2
tests/discard/tvoidcontext.nim
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@@ -1,5 +1,5 @@
discard """
errormsg: '''expression '"invalid"' is of type 'string' and has to be discarded'''
errormsg: '''expression '"invalid"' is of type 'string' and has to be used (or discarded)'''
line: 12
"""

2
tests/errmsgs/tdont_show_system.nim
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@@ -1,5 +1,5 @@
discard """
errormsg: "expression 'true' is of type 'bool' and has to be discarded"
errormsg: "expression 'true' is of type 'bool' and has to be used (or discarded)"
line: 13
file: "tdont_show_system.nim"
"""