[Issue 18030] New: Segmentation fault with __traits(getProtection) on template function.

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18030

          Issue ID: 18030
           Summary: Segmentation fault with __traits(getProtection) on
                    template function.
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: regression
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: dmdreport123 at yandex.ru

The following code causes dmd to crash with a segmentation fault:
----
struct S(T)
{
        T var;
        pragma(
                msg,
                "Inside S: func() is ",
                __traits(getProtection, __traits(getMember, T, "func"))
        );
}

class C
{
        alias Al = S!C;

        static int func(U)(U var)
        {
                return 123;
        }
        pragma(
                msg,
                "Inside C: func() is ",
                __traits(getProtection, __traits(getMember, C, "func"))
        )
}

void main() {}
----
$ dmd app.d
Inside S: func() is Segmentation fault
----

This error first appeared in dmd2.075.

Here is a simple test project on github and tests results from travis-ci.
https://github.com/Betelgeyser/getprotectionbug
https://travis-ci.org/Betelgeyser/getprotectionbug

If C.func() has no template parameters or __traits(getProtection) is not called
inside struct S, then the code compiles. Calling __traits(getProtection) inside
class C does not result in a segfault. Whether S and C are classes or structs
does not affect this error.

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