[Issue 18136] ICE in dmd/statement.d(426)

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18136

--- Comment #2 from Seb <greensunny12 at gmail.com> ---
Reduced example without Phobos:


---
template ReturnType(func...)
{
    static if (is(FunctionTypeOf!func R ))
        alias ReturnType = R;
}

template FunctionTypeOf(func...)
{
    static if (is(typeof(func) T))
        static if (is(T Fptr ) )
        alias FunctionTypeOf = Fptr;
}

    enum isInputRange(R) =
is(ReturnType!((R r) => r.empty) )
    && is(typeof((R r) => r.popFront));


@property empty(T)(const(T) ){}


void popFront(T)(T) {}

template unaryFun(alias fun)
{
    alias unaryFun = fun;
}

template map(fun...)
{
    auto map(Range)(Range ) if (isInputRange!Range)
    {
        alias RE = Range;
        alias _fun = unaryFun!fun;
        !is(typeof(_fun(RE.init)) );
    }
}

auto joiner(){}

struct RegexMatch(R)
{
    void popFront(){}

    bool empty() { }
}

auto matchMany(RegEx, R)(R , RegEx ) {
    return RegexMatch!R();
}

auto matchAll(R, RegEx)(R input, RegEx re)
{
    return matchMany(input, re);
}

void main()
{
    string[] messages;

    auto issueRE = "foo";
    messages.map!(m => m.matchAll(issueRE).map);
}
---

--