void bug4072(T)(T x)
   if (is(typeof(bug4072(x))))
{}

static assert(!is(typeof(bug4072(7))));

-----
PATCH:

template.c line 1421.
-----------------------------------
        Objects dedargs;
+        static int nest = 0;
+        if (++nest > 300)
+        {
+            global.gag = 0;            // ensure error message gets printed
+            error("recursive expansion");
+            if (sc->tinst) sc->tinst->printInstantiationTrace();
+            fatal();
+        }
        m = td->deduceFunctionTemplateMatch(loc, targsi, ethis, fargs, &dedargs);
+        --nest;
        //printf("deduceFunctionTemplateMatch = %d\n", m);
        if (!m)                 // if no match
            continue;