default '==' on structs

[spir]

On 02/02/2011 07:05 PM, bearophile wrote:
> spir:
>
>> * The issue reported is about '==' on structs not using member opEquals when
>> defined, instead performing bitwise comparison. This is not my case: Lexeme
>> members are plain strings and an uint. They should just be compared as is.
>> Bitwise comparison should just work fine.
>> Also, this issue is marked solved for dmd 2.037 (I use 2.051).
>
> Lars is right, the == among structs is broken still:
>
> struct Foo { string s; }
> void main() {
>      string s1 = "he";
>      string s2 = "llo";
>      string s3 = "hel";
>      string s4 = "lo";
>      auto f1 = Foo(s1 ~ s2);
>      auto f2 = Foo(s3 ~ s4);
>      assert((s1 ~ s2) == (s3 ~ s4));
>      assert(f1 == f2);
> }

Thank you, this helps much. I don't get the details yet, but think some similar 
issue is playing a role in my case. String members of the compared Lexeme 
structs are not concatenated, but one of them is sliced from the scanned source.
If I dup'ed instead of slicing, this would create brand new strings; thus '==' 
performing bitwise comp should run fine, don't you think? I'll try in a short 
while.

Do you know more about why/how the above fails?

Denis
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