more tests

src/processor/files.rs

@@ -1,10 +1,11 @@
 use anyhow::{Context, Result};
 use std::{
+    fmt::Debug,
     fs,
     path::{Path, PathBuf},
 };
 
-#[derive(Debug, PartialEq, Eq, Clone, Hash)]
+#[derive(PartialEq, Eq, Clone, Hash)]
 pub(crate) struct SourceFile {
     pub(crate) path: PathBuf,
 }
@@ -77,3 +78,9 @@ impl Changes {
         self.any_change
     }
 }
+
+impl Debug for SourceFile {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        <Path as Debug>::fmt(&self.path, f)
+    }
+}

src/processor/mod.rs

@@ -130,6 +130,7 @@ impl Minimizer {
         }
     }
 
+    #[instrument(skip(self, pass, invalidated_files, changes), fields(pass = %pass.name()), level = "debug")]
     fn process_file<'file>(
         &self,
         pass: &mut dyn Processor,

src/processor/reaper.rs

@@ -32,6 +32,8 @@ impl Minimizer {
             .get_diags()
             .context("getting suggestions from rustc")?;
 
+        debug!(?diags, "Got diagnostics");
+
         let mut suggestions_for_file = HashMap::<_, Vec<_>>::new();
         for suggestion in &suggestions {
             suggestions_for_file
@@ -197,7 +199,8 @@ impl<'a> FindUnusedFunction<'a> {
                     "encountered multiline span in dead_code"
                 );
 
-                if Path::new(&span.file_name) != file.path {
+                // When the project directory is remapped, the path may be absolute or generally have some prefix.
+                if !file.path.ends_with(&span.file_name) {
                     return None;
                 }