Update rust syntax: char literal (#2162)

Highlight character literals started with a single quote (').
Importantly this ensures correct highlighting for the character literal '"'.
Limitation: rust char literals contain exactly one character, however this isn't checked by the highlighter.

Closes #2160

diff --git a/runtime/syntax/rust.yaml b/runtime/syntax/rust.yaml
index f24bcfb95b40211cef7231f07394cb3787cc7dfd..3e13f388f8ceeb7d5f8909944f4106c7606e6ae8 100644 (file)
--- a/runtime/syntax/rust.yaml
+++ b/runtime/syntax/rust.yaml
@@ -24,15 +24,23 @@ rules:
     - constant.string:
         start: "\""
         end: "\""
-        skip: "\\\\."
+        skip: '\\.'
         rules:
-            - constant.specialChar: "\\\\."
+            - constant.specialChar: '\\.'
 
     - constant.string:
         start: "r#+\""
         end: "\"#+"
         rules: []
 
+    # Character literals
+    - constant.string:
+        start: "'"
+        end: "'"
+        skip: '\\.'
+        rules:
+            - constant.specialChar: '\\.'
+
     - comment:
         start: "//"
         end: "$"
@@ -49,4 +57,3 @@ rules:
         start: "#!\\["
         end: "\\]"
         rules: []
-