mirror of
https://gitlab.com/freepascal.org/fpc/source.git
synced 2025-11-04 05:39:29 +01:00
4682ac269d
An uninitialized function Result of a managed type needs special handling.
When passing it as a var parameter a warning need to be emitted, since a user
may expect Result to be empty (nil) by default as it happens with local vars
of a managed type. But this is not true for Result and may lead to serious issues.
The only exception is SetLength(Result, ?) for a string Result. A user always
expects undefined contents of the string after calling SetLength(). In such
case a hint need to be emitted.
+ Tests for this.
git-svn-id: trunk@40216 -
28 lines
525 B
ObjectPascal
28 lines
525 B
ObjectPascal
{ %fail% }
|
|
{ %opt=-Sew -vw -O- }
|
|
|
|
{
|
|
Test for correct emitting of warnings/hints for uninitialized variables of management types
|
|
See also tbf/tb0258.pp
|
|
}
|
|
|
|
// This code must issue warnings "Function result variable of a managed type does not seem to be initialized".
|
|
|
|
{$mode objfpc}
|
|
|
|
procedure fvar(var a: ansistring);
|
|
begin
|
|
setlength(a,100);
|
|
a[2]:='a';
|
|
end;
|
|
|
|
function f: ansistring;
|
|
begin
|
|
// Warning for the ansistring Result, since initial contents of the Result is undefined.
|
|
fvar(Result);
|
|
end;
|
|
|
|
begin
|
|
f;
|
|
end.
|