[Issue 20280] New: Compiler segfault when building two small files

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20280

          Issue ID: 20280
           Summary: Compiler segfault when building two small files
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: major
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: briancschott at gmail.com

Steps to reproduce: 

1) Create a.d and b.d with the following contents

a.d:
----------------------------------------
struct Alpha(uint _)
{
    import a;
}

struct Foxtrot(uint _)
{
    alias Attributes = Alpha!10;
    enum A = 10;
}
----------------------------------------

b.d:
----------------------------------------
import a;

alias Charlie = Foxtrot!(0);
----------------------------------------

2) Run the compiler. `dmd a.d b.d`

I've been able to reproduce this issue with several front-end versions. It is
present in 2.088.1-beta.1 as well.

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