Support tuple index expressions in Rust lexer (rouge-ruby#1580)

Currently, the Rust lexer does not support tuple index expressions. This commit adds that support. To differentiate between tuple index expressions and field access expressions, the `Name::Attribute` token is used. Co-authored-by: Michael Camilleri <[email protected]>
NSHipster · May 19, 2021 · 863fe6b · 863fe6b
1 parent c281af7
commit 863fe6b
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diff --git a/lib/rouge/lexers/rust.rb b/lib/rouge/lexers/rust.rb
@@ -100,6 +100,7 @@ def macro_closed?
 
         rule %r/([.]\s*)?#{id}(?=\s*[(])/m, Name::Function
         rule %r/[.]\s*#{id}/, Name::Property
+        rule %r/[.]\s*\d+/, Name::Attribute
         rule %r/(#{id})(::)/m do
           groups Name::Namespace, Punctuation
         end

diff --git a/spec/visual/samples/rust b/spec/visual/samples/rust
@@ -413,3 +413,8 @@ async fn learn_and_sing() {
     let song = learn_song().await;
     sing_song(song).await;
 }
+
+fn tuple_access() {
+    let t: (i32, i32) = (42, 13);
+    let f: t.0;
+}