HACK: print contents of rust tmp files on failure

.travis.yml

@@ -227,12 +227,12 @@ matrix:
         - rustup target add x86_64-unknown-redox
       script:
         # Test all crates, and the top-level crate with all features:
-        - cargo build --target=x86_64-sun-solaris --all --all-features
-        - cargo build --target=x86_64-unknown-cloudabi --all --all-features
-        - cargo build --target=x86_64-unknown-freebsd --all --all-features
+        - cargo build --target=x86_64-sun-solaris --all --all-features || for f in "$(ls -dt /tmp/rust* | head -1)/*"; do ls -l $f; cat $f; done
+        - cargo build --target=x86_64-unknown-cloudabi --all --all-features || for f in "$(ls -dt /tmp/rust* | head -1)/*"; do ls -l $f; cat $f; done
+        - cargo build --target=x86_64-unknown-freebsd --all --all-features || for f in "$(ls -dt /tmp/rust* | head -1)/*"; do ls -l $f; cat $f; done
         #- cargo build --target=x86_64-unknown-fuchsia --all --all-features
-        - cargo build --target=x86_64-unknown-netbsd --all --all-features
-        - cargo build --target=x86_64-unknown-redox --all --all-features
+        - cargo build --target=x86_64-unknown-netbsd --all --all-features || for f in "$(ls -dt /tmp/rust* | head -1)/*"; do ls -l $f; cat $f; done
+        - cargo build --target=x86_64-unknown-redox --all --all-features || for f in "$(ls -dt /tmp/rust* | head -1)/*"; do ls -l $f; cat $f; done
 
     # Trust cross-built/emulated targets. We must repeat all non-default values.
     - rust: stable