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digitalmars.D.learn - std.typecons.Proxy requires a nothrow destructor and toHash?

reply Saurabh Das <saurabh.das gmail.com> writes:
struct A
{
     import std.stdio;
     File f;
}

struct B
{
     A a;

     import std.typecons;
     mixin Proxy!a;
}

rdmd proxytest.d:
/Library/D/dmd/src/phobos/std/typecons.d(5055): Error: 
'proxytest.A.~this' is not nothrow
/Library/D/dmd/src/phobos/std/typecons.d(5050): Error: function 
'proxytest.B.Proxy!(a).toHash' is nothrow yet may throw
Failed: ["dmd", "-v", "-o-", "proxytest.d", "-I."]

Why doesn't this work? Is it a requirement that a proxied struct 
must have a nothrow destructor and toHash?
Feb 03 2016
parent reply Marc =?UTF-8?B?U2Now7x0eg==?= <schuetzm gmx.net> writes:
On Wednesday, 3 February 2016 at 10:16:56 UTC, Saurabh Das wrote:

 Why doesn't this work? Is it a requirement that a proxied 
 struct must have a nothrow destructor and toHash?


It used to work in 2.066.1; bisecting points to this PR:
https://github.com/D-Programming-Language/phobos/pull/3043

When bisecting between 2.066 and 2.067, there are other 
candidates:
https://github.com/D-Programming-Language/phobos/pull/3042
https://github.com/D-Programming-Language/dmd/pull/4459
https://github.com/D-Programming-Language/druntime/pull/1188

Unlikely:
https://github.com/D-Programming-Language/phobos/pull/3001
https://github.com/D-Programming-Language/phobos/pull/3043
https://github.com/D-Programming-Language/dmd/pull/4452
https://github.com/D-Programming-Language/dmd/pull/4463

Please file a bug report at:
https://issues.dlang.org/enter_bug.cgi
Feb 03 2016
parent Saurabh Das <saurabh.das gmail.com> writes:
On Wednesday, 3 February 2016 at 12:10:01 UTC, Marc Schütz wrote:

 On Wednesday, 3 February 2016 at 10:16:56 UTC, Saurabh Das 
 wrote:

 [...]


 It used to work in 2.066.1; bisecting points to this PR:
 https://github.com/D-Programming-Language/phobos/pull/3043

 When bisecting between 2.066 and 2.067, there are other 
 candidates:
 https://github.com/D-Programming-Language/phobos/pull/3042
 https://github.com/D-Programming-Language/dmd/pull/4459
 https://github.com/D-Programming-Language/druntime/pull/1188

 Unlikely:
 https://github.com/D-Programming-Language/phobos/pull/3001
 https://github.com/D-Programming-Language/phobos/pull/3043
 https://github.com/D-Programming-Language/dmd/pull/4452
 https://github.com/D-Programming-Language/dmd/pull/4463

 Please file a bug report at:
 https://issues.dlang.org/enter_bug.cgi


Oh, okay. Thanks!

Bug report filed: https://issues.dlang.org/show_bug.cgi?id=15641
Feb 03 2016