[gtksourceview] rust.lang: add indirect style for lifetime

[Christian Hergert <chergert src gnome org>]

commit 8eb97c096944f64353e49157b5a7754c5a73655a
Author: Christian Hergert <chergert redhat com>
Date:   Thu Dec 30 19:22:17 2021 -0800

    rust.lang: add indirect style for lifetime
    
    This allows style schemes to alter the style with rust:lifetime and treat
    them differently than keywords.

 data/language-specs/rust.lang | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/data/language-specs/rust.lang b/data/language-specs/rust.lang
index 832bb532..b29108f5 100644
--- a/data/language-specs/rust.lang
+++ b/data/language-specs/rust.lang
@@ -54,6 +54,7 @@ except according to those terms.
     <style id="attribute"  name="Attribute"     map-to="def:preprocessor"/>
     <style id="macro"      name="Macro"         map-to="def:preprocessor"/>
     <style id="error"      name="Error"         map-to="def:error"/>
+    <style id="lifetime"   name="Lifetime"      map-to="rust:keyword"/>
   </styles>
 
   <definitions>
@@ -223,7 +224,7 @@ except according to those terms.
       </match>
     </context>
 
-    <context id="lifetime" style-ref="keyword">
+    <context id="lifetime" style-ref="lifetime">
       <match extended="true">
         '\%{ident}
       </match>