This D2 code looks correct:


void main() {
    const struct S1 {}
    immutable struct S2 {}
    static const struct S3 {}
    static immutable struct S4 {}
}


But DMD 2.050 shows the compilation errors:

test.d(2): basic type expected, not struct
test.d(2): no identifier for declarator int
test.d(2): semicolon expected, not 'struct'
test.d(3): basic type expected, not struct
test.d(3): no identifier for declarator int
test.d(3): semicolon expected, not 'struct'
test.d(4): basic type expected, not struct
test.d(4): no identifier for declarator int
test.d(4): semicolon expected, not 'struct'
test.d(5): basic type expected, not struct
test.d(5): no identifier for declarator int
test.d(5): semicolon expected, not 'struct'