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digitalmars.D.bugs - [Issue 2848] New: static if (is(type)) + alias fails to compile

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=2848

           Summary: static if (is(type)) + alias fails to compile
           Product: D
           Version: 1.043
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: bugzilla digitalmars.com
        ReportedBy: llucax gmail.com


This simple test fails to compile:

static if (!is(typeof(no_type)))
        alias char[] no_type;
no_type x;

In all D compilers available, tested in GDC, DMD 1.043, DMD 2.027 and LDC r1197
(so it seems like a front-end issue).

The error is:
t.d:3: Error: identifier 'no_type' is not defined
t.d:3: Error: no_type is used as a type
t.d:3: variable t.x voids have no value


This test doesn't compile either:

static if (!is(typeof(no_type))) {
        alias char[] no_type;
        no_type y;
}

Error:
t.d(3): Error: identifier 'no_type' is not defined
t.d(3): Error: no_type is used as a type
t.d(3): variable t.x voids have no value


--
Apr 17 2009
next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=2848






BTW, using static if (is(typeof(no_type))) doesn't work either.


--
Apr 17 2009
prev sibling next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=2848






It seems to happen for array, int and float aliasee, but not for Object or
struct types...

This workaround works:

alias char[] String;
static if (!is(no_type)) {
         alias String no_type;
         no_type y;
}
no_type x;

It seems not to fail when aliassed to user-defined types (classes, structs,
enums, aliases, typedefs), but for primitive types and arrays it fails.

typedef have the same problem.


--
Apr 17 2009
prev sibling next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=2848






Workaround:
----
alias char[] String;

static if (!is(no_type))
        alias String no_type;
no_type x;
----

It seems to fail when the aliased type is a primitive type or array (static,
dynamic or associative).

It doesn't fail if it's a class, struct, enum, typedef or aliased type.


--
Apr 17 2009
prev sibling next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=2848




PDT ---
Works in DMD 1.062, I don't know when it got fixed. I guess it will work in DMD
2.0xx, but I don't have one installed to test.

If somebody wants to try it, this bug can be closed (maybe Don who seems to
bisect a lot and has an environment to do that easily wants to bisect DMD to
see when it got fixed and add the proper changelog entry ;).

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Jun 21 2010
prev sibling next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=2848


Don <clugdbug yahoo.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |clugdbug yahoo.com.au
         Resolution|                            |FIXED





 Works in DMD 1.062, I don't know when it got fixed. I guess it will work in DMD
 2.0xx, but I don't have one installed to test.
 
 If somebody wants to try it, this bug can be closed (maybe Don who seems to
 bisect a lot and has an environment to do that easily wants to bisect DMD to
 see when it got fixed and add the proper changelog entry ;).


No probs.
Fixed DMD 1.050.

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Jun 21 2010
prev sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=2848




PDT ---




 Works in DMD 1.062, I don't know when it got fixed. I guess it will work in DMD
 2.0xx, but I don't have one installed to test.
 
 If somebody wants to try it, this bug can be closed (maybe Don who seems to
 bisect a lot and has an environment to do that easily wants to bisect DMD to
 see when it got fixed and add the proper changelog entry ;).


 No probs.
 Fixed DMD 1.050.


Thanks =)

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Jun 22 2010