tests: Add RUST_BACKTRACE and -Cpanic revisions to panic-main.rs test

Author: Enselic

tests/ui/panics/panic-main.rs

@@ -1,3 +1,26 @@
+//@ revisions: default abort-zero abort-one abort-full unwind-zero unwind-one unwind-full
+
+//@[abort-zero] compile-flags: -Cpanic=abort
+//@[abort-zero] no-prefer-dynamic
+//@[abort-zero] exec-env: RUST_BACKTRACE=0
+
+//@[abort-one] compile-flags: -Cpanic=abort
+//@[abort-one] no-prefer-dynamic
+//@[abort-one] exec-env: RUST_BACKTRACE=1
+
+//@[abort-full] compile-flags: -Cpanic=abort
+//@[abort-full] no-prefer-dynamic
+//@[abort-full] exec-env: RUST_BACKTRACE=full
+
+//@[unwind-zero] compile-flags: -Cpanic=unwind
+//@[unwind-zero] exec-env: RUST_BACKTRACE=0
+
+//@[unwind-one] compile-flags: -Cpanic=unwind
+//@[unwind-one] exec-env: RUST_BACKTRACE=1
+
+//@[unwind-full] compile-flags: -Cpanic=unwind
+//@[unwind-full] exec-env: RUST_BACKTRACE=full
+
 //@ run-fail
 //@ error-pattern:moop
 //@ needs-subprocess