diff --git a/codespan-reporting/src/term/views/diagnostic.rs b/codespan-reporting/src/term/views/diagnostic.rs
index 26271fb..2e605cf 100644
--- a/codespan-reporting/src/term/views/diagnostic.rs
+++ b/codespan-reporting/src/term/views/diagnostic.rs
@@ -9,10 +9,7 @@ use crate::term::Config;
 use super::{Header, Locus, NewLine, SourceSnippet};
 
 /// Output a richly formatted diagnostic, with source code previews.
-pub struct RichDiagnostic<'a, Source>
-where
-    Source: AsRef<str>,
-{
+pub struct RichDiagnostic<'a, Source> {
     files: &'a Files<Source>,
     diagnostic: &'a Diagnostic,
 }
@@ -70,10 +67,7 @@ where
 }
 
 /// Output a short diagnostic, with a line number, severity, and message.
-pub struct ShortDiagnostic<'a, Source>
-where
-    Source: AsRef<str>,
-{
+pub struct ShortDiagnostic<'a, Source> {
     files: &'a Files<Source>,
     diagnostic: &'a Diagnostic,
 }
diff --git a/codespan-reporting/src/term/views/source_snippet.rs b/codespan-reporting/src/term/views/source_snippet.rs
index e5fd29d..73befb3 100644
--- a/codespan-reporting/src/term/views/source_snippet.rs
+++ b/codespan-reporting/src/term/views/source_snippet.rs
@@ -31,10 +31,7 @@ pub use self::underline::MarkStyle;
 ///   = expected type `Int`
 ///        found type `String`
 /// ```
-pub struct SourceSnippet<'a, Source>
-where
-    Source: AsRef<str>,
-{
+pub struct SourceSnippet<'a, Source> {
     files: &'a Files<Source>,
     file_id: FileId,
     spans: Vec<(&'a Label, MarkStyle)>,
diff --git a/codespan/src/file.rs b/codespan/src/file.rs
index 0621cbe..8a923bb 100644
--- a/codespan/src/file.rs
+++ b/codespan/src/file.rs
@@ -96,10 +96,7 @@ impl FileId {
 /// [`Rc<str>`]: std::rc::Rc
 /// [`Arc<str>`]: std::sync::Arc
 #[derive(Clone, Debug)]
-pub struct Files<Source>
-where
-    Source: AsRef<str>,
-{
+pub struct Files<Source> {
     files: Vec<File<Source>>,
 }
 
@@ -282,10 +279,7 @@ where
 /// A file that is stored in the database.
 #[derive(Debug, Clone)]
 #[cfg_attr(feature = "serialization", derive(Deserialize, Serialize))]
-struct File<Source>
-where
-    Source: AsRef<str>,
-{
+struct File<Source> {
     /// The name of the file.
     name: OsString,
     /// The source code of the file.