[Issue 5436] New: tightening auto decl spec

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=5436

           Summary: tightening auto decl spec
           Product: D
           Version: unspecified
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: ellery-newcomer at utulsa.edu


--- Comment #0 from Ellery Newcomer <ellery-newcomer at utulsa.edu> 2011-01-08 19:31:58 PST ---
In spec and implementation, auto decls are defined as

StorageClasses Identifier = Initializer, etc ;

However, as near as I can tell, Initializer could be replaced with Expression
with no loss, as none of the initializer forms disjoint from Expression allow
type deduction. 

You could argue that something like this could work:

auto x = [s, {a:1,b:2,c:3}];

but it doesn't. Maybe you could argue for the indexed initializers like:

int[] x = [4,1:2];

but thankfully, that isn't implemented for auto decls either.

It really doesn't make sense to have the compiler parse things which will never
pass semantic analysis, so I propose that both spec and implementation be
changed to

StorageClasses Identifier = Expression, etc ;

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