https://issues.dlang.org/show_bug.cgi?id=15551

          Issue ID: 15551
           Summary: default construction disabled with default arguments
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: regression
          Priority: P1
         Component: dmd
          Assignee: nobody@puremagic.com
          Reporter: wikodes@gmail.com

Working with dmd.2.069.2
Fail with nightly build 2016-01-11.

----
cat > bug.d << EOF
struct S {
    this(string r = ".") {
    }
}

void test() {
    S ok();
    S err;
}
EOF

dmd -c bug.d
----
./bug.d(41): Error: variable bug.test.err default construction is disabled for
type S
----

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