bug in mixin template elision

[Adam D. Ruppe]

On Tuesday, 25 June 2019 at 00:42:25 UTC, Bart wrote:
>    void fooo() { }    // Comment out and behavior changes!
>    void mark() { fooo(); } // Seems mark does not lazily wait 
> to see if fooo is defined outside the template but uses fooo 
> directly.

Just use

void mark() { this.fooo(); }

and it will use specifically the one off `this` instead of the 
local scope.