[Issue 12931] Make const, immutable, inout, and shared illegal as function attributes on the left-hand side of a function

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=12931

--- Comment #11 from hsteoh at quickfur.ath.cx ---
Totally agreed. 'const' is an especially egregious problem for newbies. Please
let's do this and kill off 'const' on the left.

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