This is the same bug box as in PR ada/34344 but it happens only in 4.2.2 and with a different test case; therefore I think this is a different bug.
package pak3 is type T1 is interface; type T2 is null record; x2: T2; function f1 (x: access T1'class) return integer; x1: integer := T1'Class (x2).f1; end pak3; gcc-4.1 -c -gnat05 pak3.ads pak3.ads:6:32: no selector "f1" for type "T1'class" defined at line 2 gcc -c pak3.ads -gnat05 +===========================GNAT BUG DETECTED==============================+ | 4.2.2 (i686-unknown-linux-gnu) Assert_Failure elists.adb:167 | | Error detected at pak3.ads:8:21 | -- Summary: [4.2 regression] Bug box, Assert_Failure elists.adb:167 on illegal Ada 2005 program Product: gcc Version: 4.2.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: ada AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: ludovic at ludovic-brenta dot org http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34380