dmd -oftest3 -version=B main.d
#ok

dmd -oftest3 -version=A main.d
Undefined symbols for architecture x86_64:
  "_D4foo24util12__ModuleInfoZ", referenced from:
      _D4main12__ModuleInfoZ in test3.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)


```d
module main;
version(A) import foo2.util;
version(B) import foo2.util2;
void main(){fun;}

module foo2.util2;
public import foo2.util;

module foo2.util;
 void fun()(){
   // these cause the link error
   import std.path;
   //import std.file;

   /+
   // these are ok
   import std.stdio;
   import std.range;
   import std.algorithm;
   +/

 }

```