[librsvg: 4/10] Make Selector a type alias for String, to clarify what goes into CssRules

[Federico Mena Quintero <federico src gnome org>]

commit 2ac5541c5ce6176378adf672f1b91ba322175882
Author: Federico Mena Quintero <federico gnome org>
Date:   Tue Apr 30 21:51:05 2019 -0500

    Make Selector a type alias for String, to clarify what goes into CssRules

 rsvg_internals/src/css.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
---
diff --git a/rsvg_internals/src/css.rs b/rsvg_internals/src/css.rs
index 8eba611d..d3f6c719 100644
--- a/rsvg_internals/src/css.rs
+++ b/rsvg_internals/src/css.rs
@@ -25,10 +25,12 @@ struct Declaration {
 // Maps property_name -> Declaration
 type DeclarationList = HashMap<String, Declaration>;
 
+type Selector = String;
+
 /// Contains all the mappings of selectors to style declarations
 /// that result from loading an SVG document.
 pub struct CssRules {
-    selectors_to_declarations: HashMap<String, DeclarationList>,
+    selectors_to_declarations: HashMap<Selector, DeclarationList>,
 }
 
 impl CssRules {