Use to_string() instead of format!("{}", ...).

cranelift/src/utils.rs

@@ -59,7 +59,7 @@ pub fn parse_sets_and_triple(
     if let Some(triple_name) = words.next() {
         let triple = match Triple::from_str(triple_name) {
             Ok(triple) => triple,
-            Err(parse_error) => return Err(format!("{}", parse_error)),
+            Err(parse_error) => return Err(parse_error.to_string()),
         };
         let mut isa_builder = isa::lookup(triple).map_err(|err| match err {
             isa::LookupError::SupportDisabled => {

lib/faerie/src/backend.rs

@@ -230,7 +230,7 @@ impl Backend for FaerieBackend {
                     to,
                     at: offset as usize,
                 })
-                .map_err(|e| ModuleError::Backend(format!("{}", e)))?;
+                .map_err(|e| ModuleError::Backend(e.to_string()))?;
         }
         for &(offset, id, addend) in data_relocs {
             debug_assert_eq!(
@@ -244,7 +244,7 @@ impl Backend for FaerieBackend {
                     to,
                     at: offset as usize,
                 })
-                .map_err(|e| ModuleError::Backend(format!("{}", e)))?;
+                .map_err(|e| ModuleError::Backend(e.to_string()))?;
         }
 
         self.artifact