inout template member function with templated 'this' doesn't properly apply inout

[dlangBugzillaToGithub]

Steven Schveighoffer (@schveiguy) reported this on 2014-05-23T22:45:40Z

Transferred from https://issues.dlang.org/show_bug.cgi?id=12793

CC List

• Jonathan Crapuchettes

Description

Sample:

struct X(Data)
{
    Data d;
    inout(Data)* foo(this This)() inout // line 4
    {
        return &d;
    }
}


void main()
{
    immutable x = X!double(5.9);
    auto r = x.foo();
}

Result:

inouttest.d(4): Error: inout on return means inout must be on a parameter as well for immutable inout(double)*()

Clearly, inout is not applying to the function when it should. Removing "(this This)" fixes the problem