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Newsgroups: comp.lang.ada
Date: Sun, 27 May 2018 10:11:25 -0700 (PDT)
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Subject: Re: Strings with discriminated records
From: NiGHTS <nights@unku.us>
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Xref: reader02.eternal-september.org comp.lang.ada:52732
Date: 2018-05-27T10:11:25-07:00
List-Id: <comp.lang.ada>

I've expanded my example to include a strange run-time crash I am getting.

Type Message (Length : Positive) is new Ada.Finalization.Controlled with record
    Text  :  String (1 .. Length);
    Cstr  :  Interfaces.C.Strings.chars_ptr;
end record;
       
function Create (Value : String) return Message is
begin
    return (
        Ada.Finalization.Controlled with Length => Value'Length, 
        Text => Value, 
        Cstr => Interfaces.C.Strings.New_String (Value) 
    );
end Create; 

procedure Finalize (
    M : in out Message
) is
begin
    Interfaces.C.Strings.Free ( M.Cstr ); -- Crashes here
end;

declare
    M : Message := Create ("Hello World");
begin
    null;
end; 

Why does my program crash on Finalization?