1 files changed, 8 insertions, 6 deletions
diff --git a/src/tools/rustfmt/src/expr.rs b/src/tools/rustfmt/src/expr.rs
index 868ff045a..3f0f217f8 100644
--- a/src/tools/rustfmt/src/expr.rs
+++ b/src/tools/rustfmt/src/expr.rs
@@ -29,9 +29,9 @@ use crate::spanned::Spanned;
 use crate::string::{rewrite_string, StringFormat};
 use crate::types::{rewrite_path, PathContext};
 use crate::utils::{
-    colon_spaces, contains_skip, count_newlines, first_line_ends_with, inner_attributes,
-    last_line_extendable, last_line_width, mk_sp, outer_attributes, semicolon_for_expr,
-    unicode_str_width, wrap_str,
+    colon_spaces, contains_skip, count_newlines, filtered_str_fits, first_line_ends_with,
+    inner_attributes, last_line_extendable, last_line_width, mk_sp, outer_attributes,
+    semicolon_for_expr, unicode_str_width, wrap_str,
 };
 use crate::vertical::rewrite_with_alignment;
 use crate::visitor::FmtVisitor;
@@ -400,7 +400,10 @@ pub(crate) fn format_expr(
             }
         }
         ast::ExprKind::Underscore => Some("_".to_owned()),
-        ast::ExprKind::IncludedBytes(..) => unreachable!(),
+        ast::ExprKind::FormatArgs(..) | ast::ExprKind::IncludedBytes(..) => {
+            // These do not occur in the AST because macros aren't expanded.
+            unreachable!()
+        }
         ast::ExprKind::Err => None,
     };
 
@@ -2050,8 +2053,7 @@ fn choose_rhs<R: Rewrite>(
 
             match (orig_rhs, new_rhs) {
                 (Some(ref orig_rhs), Some(ref new_rhs))
-                    if wrap_str(new_rhs.clone(), context.config.max_width(), new_shape)
-                        .is_none() =>
+                    if !filtered_str_fits(&new_rhs, context.config.max_width(), new_shape) =>
                 {
                     Some(format!("{}{}", before_space_str, orig_rhs))
                 }