...foreach on that structure and bind the params, etc.

First try (Fail-1):

// ----------------------------------------
auto selector...

...if (global.params.mapfile)
-        cmdbuf.writestring(global.params.mapfile);
+        writeFilename(&cmdbuf, global.params.mapfile);
     else...

...break;
        -:  668:            case TOKinvariant:
    #####:  669:                if (!global.params.useDeprecated)
    #####:  670:                    error("use of 'invariant' rather...

...ve already had to hack the template params so shared vs. unshared concrete types would...

...429,13 @@
         sc->module->toModuleAssert();
     }

+    if (/*global.params.useUnitTests &&*/ sc->module)
+    {
+        // Generate this function as...

...two arguments and returning an integer value.
       * Params:
       *    a = an integer argument.
       *    s = a constant...

...if TARGET_OSX
    global.params.pic = 1;
#endif

[...]

    if (global.params.pic)
        VersionCondition::addPredefinedGlobalIdent("D...

...that are passed to it (out/ref params), without having to inspect the function signature...

...types;          // types of parameters
    alias ParameterStorageClassTuple!(func) params; // storage class of
parameters

    string declString, callString...

...rvalue = replace(a.front, '+', ' ');
    params[lvalue] = rvalue;
    a.popFront;
    assert (a.empty);
}
return params;
}

Tomek