[Issue 13394] New: invariant fail to link since 2.066 when using separate compilation

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13394

          Issue ID: 13394
           Summary: invariant fail to link since 2.066 when using separate
                    compilation
           Product: D
           Version: D2
          Hardware: x86
                OS: Mac OS X
            Status: NEW
          Severity: regression
          Priority: P1
         Component: DMD
          Assignee: nob...@puremagic.com
          Reporter: deadal...@gmail.com

a.d :
module a;

import std.utf;

class A {
    this() { }
}

class Btpl(T) : T {
    this()() { }

    invariant {}
}

alias B = Btpl!A;

-------------

b.d :
module b;

import a;

void main() {
    new B();
}

-------------

$ dmd -c a.d && dmd -c b.d && dmd *.o
Undefined symbols for architecture x86_64:
  "_D1a15__T4BtplTC1a1AZ4Btpl11__invariantMxFZv", referenced from:
     
_D1a15__T4BtplTC1a1AZ4Btpl11__T6__ctorZ6__ctorMFZC1a15__T4BtplTC1a1AZ4Btpl in
b.o
ld: symbol(s) not found for architecture x86_64
collect2: error: ld returned 1 exit status
--- errorlevel 1

It has to be noted that importing std.utf seems to play a role here, which is
weird.

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