Use write_str.

src/ast.rs

@@ -1776,7 +1776,7 @@ impl fmt::Debug for Expr {
                     Some((_, ref namespace)) => write!(f, "{}", namespace)?,
                     _ => (),
                 }
-                write!(f, "{}", x.2)?;
+                f.write_str(&x.2)?;
                 match i.map_or_else(|| x.0, |n| NonZeroUsize::new(n.get() as usize)) {
                     Some(n) => write!(f, ", {}", n)?,
                     _ => (),

src/dynamic.rs

@@ -692,7 +692,7 @@ impl fmt::Debug for Dynamic {
                     return fmt::Debug::fmt(_value_any.downcast_ref::<i128>().expect(CHECKED), f);
                 }
 
-                write!(f, "{}", value.type_name())
+                f.write_str(value.type_name())
             }
 
             #[cfg(not(feature = "no_closure"))]

src/result.rs

@@ -172,7 +172,7 @@ impl fmt::Display for EvalAltResult {
 
             Self::ErrorModuleNotFound(s, _) => write!(f, "{}: '{}'", desc, s)?,
 
-            Self::ErrorDotExpr(s, _) if !s.is_empty() => write!(f, "{}", s)?,
+            Self::ErrorDotExpr(s, _) if !s.is_empty() => f.write_str(s)?,
 
             Self::ErrorIndexingType(s, _) => write!(f, "Indexer not registered for type '{}'", s)?,