Don't backtrace failures on windows

alexcrichton · alexcrichton · commit ab3a54c66f50 · 2017-09-26T20:03:01.000-07:00
diff --git a/.appveyor.yml b/.appveyor.yml
@@ -20,5 +20,4 @@ build: false
 
 test_script:
   - cargo test --target %TARGET%
-  - set RUST_BACKTRACE=1
   - cargo test --target %TARGET% --release
