[Bug c/124533] musttail: __attribute__ syntax behavior differs in odd ways from [[gnu::musttail]]

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124533

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
The attribute in this case is applying to the label rather the next statement. 
A semicolon after the label fixes that.
 Ambiguity. 

Also gcc almost never errors out if an attribute does not applies.
E.g musttail on say a variable.