• d-bugmail puremagic.com (60/60) Jan 22 2013 http://d.puremagic.com/issues/show_bug.cgi?id=9367

d-bugmail puremagic.com writes:

http://d.puremagic.com/issues/show_bug.cgi?id=9367

           Summary: private in mixin template
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: luka8088 owave.net



Upgrading to D v2.061 broke my code so I investigated and found inconsistent
behavior. The following example compiled in D v2.060:

// main.d

import foo;

void main () {
  mixin m m1;
}

// foo.d

module foo;

private struct s {
  int i;
}

mixin template m () {
  s s1;
}

// foo.d(9): Error: module main foo.s is private

So I am not sure if this is a bug or was it a bug before, and there is actually
no any documentation for this specific case (that I could find). It only says
"Unlike a template instantiation, a template mixin's body is evaluated within
the scope where the mixin appears, not where the template declaration is
defined. It is analogous to cutting and pasting the body of the template into
the location of the mixin." so it could be understood that mixin template can
only see symbols from a scope that it is included in. On the other hand, if
that is the expected behavior, then the following code should not compile (at
least I think):

// main.d

import foo;

void main () {
  mixin c.m m1;
}

// foo.d

module foo;

class b {
  private struct s {
    int i;
  }
}

class c {
  mixin template m () {
    b.s s1;
  }
}


Anyway, I think that the expected behavior in this cases should be better
documented.

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