Hi, I added the testcase and closed the PR as fixed in 4.7.3 and mainline.
Paolo. /////////////////
2013-03-05 Paolo Carlini <paolo.carl...@oracle.com> PR c++/56530 * g++.dg/warn/Wsign-conversion-2.C: New.
Index: g++.dg/warn/Wsign-conversion-2.C =================================================================== --- g++.dg/warn/Wsign-conversion-2.C (revision 0) +++ g++.dg/warn/Wsign-conversion-2.C (working copy) @@ -0,0 +1,11 @@ +// PR c++/56530 +// { dg-options "-Wsign-conversion" } + +struct string +{ + string () {}; + ~string () {}; +}; + +string foo[1]; // okay +string bar[1][1]; // gives bogus warning