don't change Display impl

src/bootstrap/src/core/config/config.rs

@@ -512,15 +512,19 @@ impl TargetSelection {
     pub fn is_windows(&self) -> bool {
         self.contains("windows")
     }
-}
 
-impl fmt::Display for TargetSelection {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        if let Some(file) = self.file { write!(f, "{file}") } else { write!(f, "{}", self.triple) }
+    /// Path to the file defining the custom target, if any.
+    pub fn filepath(&self) -> Option<&Path> {
+        self.file.as_ref().map(Path::new)
+        /*if let Some(ref p) = self.file.as_ref {
+            Some(Path::new(p))
+        } else {
+            None
+        }*/
     }
 }
 
-impl fmt::Debug for TargetSelection {
+impl fmt::Display for TargetSelection {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         write!(f, "{}", self.triple)?;
         if let Some(file) = self.file {
@@ -530,6 +534,12 @@ impl fmt::Debug for TargetSelection {
     }
 }
 
+impl fmt::Debug for TargetSelection {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "{self}")
+    }
+}
+
 impl PartialEq<&str> for TargetSelection {
     fn eq(&self, other: &&str) -> bool {
         self.triple == *other

src/bootstrap/src/core/sanity.rs

@@ -12,7 +12,7 @@ use std::collections::HashMap;
 #[cfg(not(feature = "bootstrap-self-test"))]
 use std::collections::HashSet;
 use std::ffi::{OsStr, OsString};
-use std::path::{Path, PathBuf};
+use std::path::PathBuf;
 use std::{env, fs};
 
 #[cfg(not(feature = "bootstrap-self-test"))]
@@ -259,18 +259,18 @@ than building it.
             has_target |= STAGE0_MISSING_TARGETS.contains(&target_str.as_str());
 
             if !has_target {
-                // This might also be a custom target, so check the target file that could have been specified by the user.
-                if Path::new(&target_str).exists() {
+            // This might also be a custom target, so check the target file that could have been specified by the user.
+                if target.filepath().is_some_and(|p| p.exists()) {
                     has_target = true;
                 } else if let Some(custom_target_path) = env::var_os("RUST_TARGET_PATH") {
                     let mut target_filename = OsString::from(&target_str);
                     // Target filename ends with `.json`.
                     target_filename.push(".json");
-
+                    
                     // Recursively traverse through nested directories.
                     let walker = walkdir::WalkDir::new(custom_target_path).into_iter();
                     for entry in walker.filter_map(|e| e.ok()) {
-                        has_target |= entry.file_name() == target_filename;
+                            has_target |= entry.file_name() == target_filename;
                     }
                 }
             }