Merge branch 'better-error-message-for-quilt' into 'master'

improve the error message when a panic happens inside expect_success function

See merge request rust-team/debcargo!44

src/debian/mod.rs

@@ -234,7 +234,7 @@ it's a maintenance burden. Use debcargo.toml instead."
                 .current_dir(&output_dir)
                 .env("QUILT_PATCHES", tempdir.path().join("patches"))
                 .args(&["push", "--quiltrc=-", "-a"]),
-            "failed to apply patches",
+            "failed to apply patches using quilt",
         );
         crate_info.replace_manifest(&output_dir.join("Cargo.toml"))?;
         expect_success(

src/util.rs

@@ -104,7 +104,7 @@ pub fn expect_success(cmd: &mut Command, err: &str) {
             }
         }
         Err(e) => {
-            panic!("{}", e);
+            panic!("{}\n{}", err, e);
         }
     }
 }