Here's something that I ran into while writing dfix`s implicit
string concatenation cleanup code:
```
// accepted
deprecated("This function is dumb and you shouldn't use it)
void deleteT3hH4rdDisk();
// accepted
deprecated("This function is dumb and" " you shouldn't use it)
void deleteT3hH4rdDisk();
// parse error
deprecated("This function is dumb and" ~ " you shouldn't use it)
void deleteT3hH4rdDisk();
```
According to this[1] the behavior is correct, however it is not
intuitive that a programmer cannot split up the string for
"deprecated" over multiple lines without depending on D's
bug-prone behavior of implicitly joining adjacent string literals.
There are two solutions to this that I see, one is to allow a
combination of string literals and "~" operators, and the other
is to allow arbitrary expressions that evaluate to a string.
Right now I favor allowing string literals and "~" because it's a
smaller change. I can write up a DIP for this if there's a decent
chance of this getting approved.
[1] http://dlang.org/grammar.html#DeprecatedAttribute
