[phobos] I applied @safe, @trusted, @system to Phobos!

[Walter Bright]

These are great comments, please add each to their own bugzilla entry if 
they aren't already.

SHOO wrote:
> I succeeded in applying @safe, @trusted, @system to Phobos after hardship.
>
> I made a branch, please look:
>
> http://svn.dsource.org/projects/phobos/branches/devel/applying_safe_system_trusted
>
> I discovered some bugs and problems about @safe, @trusted, @system
> during my work.
>
> 1. Bugzilla 4211 - struct with annotation(@safe)
>     See also http://d.puremagic.com/issues/show_bug.cgi?id=4211
>
> 2. Bugzilla 4218 - safe function cannot call opApply
>     See also http://d.puremagic.com/issues/show_bug.cgi?id=4218
>
> 3. I cannot apply @safe to intrinsic operation(eg: std.math.sqrt)
>     This causes mangling that had been influenced by @safe/@trusted.
>     dmd converts a specific symbol into intrinsic operation. However,
> dmd cannot convert symbols that are marked by @safe/@trusted.
>     I am skeptical about the influence on mangling rule by @safe.
>
> 4. dmd should not allow overload between @safe/@trusted and @system
>     Document says "Functions are overloaded based on how well the
> arguments to a function can match up with the parameters."
>     But @safe functions can overload between @system functions, though
> @safe is unrelated to parameters.
>     It's enough to have only @safe function.
>
> 5. druntime's modules are not applying @safe/@system/@trusted
>     This shows that Exception, TypeInfo, Thread and others are not
> usable by the @safe function virtually.
>
> 6. You must make the template function @trusted by all means
>     When you use template, type that is maked @system may be handed to
> parameters.
>     Therefore @trusted is required.
>     This means that every template functions cannot take benefits from
> @safe.
>
> 7. Some mysterious compile errors
>     When @safe unittest...
>     Some functions are going to call opAssign. (eg: std.range(2670))
>     Some functions are going to call __cpctor. (eg: std.stdio(165))
>     Some functions are going to call ~this. (eg: std.stdio(872))
>     (I try compile command: "dmd -I.. -c -o- -unittest -debug stdio.d")
>
> Please do not make it an useless treasure.
> I really wait for the day when this is used effectively.
>
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