http://d.puremagic.com/issues/show_bug.cgi?id=9270
Summary: Undetected ref escape of local slice
Product: D
Version: D2
Platform: x86
OS/Version: Windows
Status: NEW
Keywords: diagnostic
Severity: normal
Priority: P2
Component: DMD
AssignedTo: [email protected]
ReportedBy: [email protected]
--- Comment #0 from [email protected] 2013-01-05 00:50:19 PST ---
(This is a borderline enhancement request.)
ref int[] foo() {
static int[5] data;
return data[0 .. 4];
}
void main() {
import std.stdio;
writeln(foo().length);
}
This program compiles with no errors or warnings (dmd 2.061), but it's wrong
code, because the data slice local to foo() gets lost when the stack frame of
foo() is popped out of the stack. Compiling that program with "-O" prints
something like:
1635172
So in this case I suggest to generate a escape local variable error at compile
time.
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