[Issue 19091] New: __traits(compiles) and error in templated structs leads to missing symbol

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19091

          Issue ID: 19091
           Summary: __traits(compiles) and error in templated structs
                    leads to missing symbol
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: default_357-line at yahoo.de

Minimized repro: 

enum compiles = __traits(compiles, Outer!());

struct Inner()
{
    // Note syntax error: missing return statement. This is important?
    int foo() { }

    void bar() { }
}

struct Outer()
{
    Inner!() field;
}

void main()
{
    Outer!()().field.bar;
}

Expected:

  Compiler error: missing return statement in foo

Got:

  Linker error: undefined reference to test.Inner.bar()

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