fix not passing tests

src/cargo/core/compiler/build_context/mod.rs

@@ -69,11 +69,11 @@ impl<'a, 'cfg> BuildContext<'a, 'cfg> {
                 }
             })?;
             rustc.push_wrapper(RustcWrapper::new(tool));
-        } else if build_config.cargo_as_rustc_wrapper {
-            let mut wrapper = RustcWrapper::new(env::current_exe()?);
-            let prog = rustc.path.as_os_str().to_owned();
-            wrapper.env("RUSTC", prog);
-            rustc.push_wrapper(wrapper);
+            // } else if build_config.cargo_as_rustc_wrapper {
+            //     let mut wrapper = RustcWrapper::new(env::current_exe()?);
+            //     let prog = dbg!(rustc.path.as_os_str().to_owned());
+            //     wrapper.env("RUSTC", prog);
+            //     rustc.push_wrapper(wrapper);
         }
 
         let host_config = TargetConfig::new(config, &rustc.host)?;

src/cargo/core/compiler/compilation.rs

@@ -75,7 +75,20 @@ pub struct Compilation<'cfg> {
 
 impl<'cfg> Compilation<'cfg> {
     pub fn new<'a>(bcx: &BuildContext<'a, 'cfg>) -> CargoResult<Compilation<'cfg>> {
-        let mut rustc = bcx.rustc.process();
+        // If we're using cargo as a rustc wrapper then we're in a situation
+        // like `cargo fix`. For now just disregard the `RUSTC_WRAPPER` env var
+        // (which is typically set to `sccache` for now). Eventually we'll
+        // probably want to implement `RUSTC_WRAPPER` for `cargo fix`, but we'll
+        // leave that open as a bug for now.
+        let mut rustc = if bcx.build_config.cargo_as_rustc_wrapper {
+            let mut rustc = bcx.rustc.process_no_wrapper();
+            let prog = rustc.get_program().to_owned();
+            rustc.env("RUSTC", prog);
+            rustc.program(env::current_exe()?);
+            rustc
+        } else {
+            bcx.rustc.process()
+        };
 
         if bcx.config.extra_verbose() {
             rustc.display_env_vars();

src/cargo/util/config.rs

@@ -197,7 +197,7 @@ impl Config {
                 .join(".rustc_info.json")
                 .into_path_unlocked()
         });
-        let wrapper = self.maybe_get_tool("rustc-wrapper")?;
+        let wrapper = self.maybe_get_tool("rustc_wrapper")?;
         Rustc::new(
             self.get_tool("rustc")?,
             wrapper,