[Issue 7343] New: hole in the type system: inout function call compiles but shouldn't
d-bugmail at puremagic.com
d-bugmail at puremagic.com
Sat Jan 21 17:13:14 PST 2012
http://d.puremagic.com/issues/show_bug.cgi?id=7343
Summary: hole in the type system: inout function call compiles
but shouldn't
Product: D
Version: D2
Platform: All
OS/Version: All
Status: NEW
Keywords: accepts-invalid
Severity: normal
Priority: P2
Component: DMD
AssignedTo: nobody at puremagic.com
ReportedBy: timon.gehr at gmx.ch
--- Comment #0 from timon.gehr at gmx.ch 2012-01-21 17:13:12 PST ---
DMD 2.057:
import std.stdio;
inout(int)** qux(inout(int) p, inout(int)** pp){
return pp;
}
void main(){
immutable(int) x;
immutable(int)* y = &x;
int z;
*qux(1,&y)=&z; // BOOM.
writeln(is(typeof(&z)==int*) &&
is(typeof( y)==immutable(int)*) &&
&z is y); // "true"
}
The code exploits the fact that inout matching does not check sanity, in order
to perform the forbidden immutable(int)** => const(int)** conversion. The code
could be slightly modified such that it performs an int** => const(int)**
conversion instead.
(Ideally, inout would be deduced as immutable in this specific example and the
assignment would cause an error.)
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