Dealing with Autodecode

[Kagamin via Digitalmars-d]

On Wednesday, 1 June 2016 at 01:36:43 UTC, Adam D. Ruppe wrote:
> version(string_migration)
> deprecated void popFront(T)(ref T t) if(isSomeString!T) {
>   static assert(0, "this is crap, fix your code.");
> }
> else
> deprecated("use -versionstring_migration to fix your buggy 
> code, would you like to know more?")
> /* existing popFront here */

version(autodecode_migration)
deprecated("autodecode attempted, use byDchar instead")
alias popFront=_d_popFront;
else
alias popFront=_d_popFront;

void _d_popFront(T)(ref T t) if(isSomeString!T) {
/* existing popFront here */
}

The migration branch should compile and work or template 
constraints will silently fail. Then deprecation messages can be 
grepped. That said does compiler print deprecation messages 
triggered inside template constraints?