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digitalmars.D.bugs - [Issue 11091] New: Deduced purity doesn't work?

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=11091

           Summary: Deduced purity doesn't work?
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: simendsjo gmail.com


--- Comment #0 from simendsjo <simendsjo gmail.com> 2013-09-22 02:49:35 PDT ---
Tried running dmd+phobos head at some code, but got errors.

This is probably the breaking change:
https://github.com/D-Programming-Language/phobos/commit/7714a9c42e2cc8d794a5ee483fdd49d52995b3ac


import std.exception;

class E: Exception
{
    this(string msg, string file=__FILE__, size_t line=__LINE__) { super(msg,
file, line); }
}

void f() pure
{
    enforceEx!E(true);
}
void main() {
    f();
}

// Error: pure function 't.f' cannot call impure function
'std.exception.enforceEx!(E).enforceEx!bool.enforceEx

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parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=11091


Kenji Hara <k.hara.pg gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |INVALID


--- Comment #1 from Kenji Hara <k.hara.pg gmail.com> 2013-09-22 04:15:34 PDT ---
This is expected change in git-head, introduced by fixing bug 10254.

In the OP code, the constructor in E is not annotated with pure. So, the
expression object creation new E("msg") is essentially impure. But in 2.063 and
earlier, NewExpression had wrongly ignored the called constructor purity and
safety (== bug 10254). Then enforceEx!E had been also incorrectly deduced to
pure.

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