[Issue 2542] New: array casts behave differently at compile and runtime

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=2542

           Summary: array casts behave differently at compile and runtime
           Product: D
           Version: 1.037
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Keywords: spec
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: bugzilla at digitalmars.com
        ReportedBy: kamm-removethis at incasoftware.de


This is related to casts of arrays not being documented:
http://d.puremagic.com/issues/show_bug.cgi?id=2494

The issue is that the following produce different results:

const short[] ct = cast(short[]) [cast(byte)1, 1]; // ct is [1, 1]
short[] rt = cast(short[]) [cast(byte)1, 1].dup; // rt is [ 257 ]

The runtime cast seems to be defined as 'reinterpret the data as an array of a
different type, recompute the length' whereas the compile time cast seems to be
'convert each element to the other element type, keep length unchanged'.


--