derive Debug on PlatformFallback

src/font/fallback/macos.rs

@@ -5,6 +5,7 @@ use unicode_script::Script;
 use super::Fallback;
 
 /// A platform-specific font fallback list, for MacOS.
+#[derive(Debug)]
 pub struct PlatformFallback;
 
 impl Fallback for PlatformFallback {

src/font/fallback/other.rs

@@ -5,6 +5,7 @@ use unicode_script::Script;
 use super::Fallback;
 
 /// An empty platform-specific font fallback list.
+#[derive(Debug)]
 pub struct PlatformFallback;
 
 impl Fallback for PlatformFallback {

src/font/fallback/unix.rs

@@ -5,7 +5,7 @@ use unicode_script::Script;
 use super::Fallback;
 
 /// A platform-specific font fallback list, for Unix.
-pub struct PlatformFallback;
+#[derive(Debug)] pub struct PlatformFallback;
 
 impl Fallback for PlatformFallback {
     fn common_fallback(&self) -> &'static [&'static str] {

src/font/fallback/windows.rs

@@ -5,6 +5,7 @@ use unicode_script::Script;
 use super::Fallback;
 
 /// A platform-specific font fallback list, for Windows.
+#[derive(Debug)]
 pub struct PlatformFallback;
 
 impl Fallback for PlatformFallback {