Merge #7578

7578: Add a semantic token type for char literals r=Veykril a=petr-tik

Fixes #7530 

The LSP spec doesn't recognise character literals, so
had to extend the suported types to our own custom type

Co-authored-by: petr-tik <petr-tik@users.noreply.github.com>

crates/rust-analyzer/src/semantic_tokens.rs

@@ -44,6 +44,7 @@ macro_rules! define_semantic_token_types {
     (BRACE, "brace"),
     (BRACKET, "bracket"),
     (BUILTIN_TYPE, "builtinType"),
+    (CHAR_LITERAL, "characterLiteral"),
     (COMMA, "comma"),
     (COLON, "colon"),
     (DOT, "dot"),

crates/rust-analyzer/src/to_proto.rs

@@ -426,7 +426,8 @@ fn semantic_token_type_and_modifiers(
         HlTag::None => semantic_tokens::GENERIC,
         HlTag::ByteLiteral | HlTag::NumericLiteral => lsp_types::SemanticTokenType::NUMBER,
         HlTag::BoolLiteral => semantic_tokens::BOOLEAN,
-        HlTag::CharLiteral | HlTag::StringLiteral => lsp_types::SemanticTokenType::STRING,
+        HlTag::StringLiteral => lsp_types::SemanticTokenType::STRING,
+        HlTag::CharLiteral => semantic_tokens::CHAR_LITERAL,
         HlTag::Comment => lsp_types::SemanticTokenType::COMMENT,
         HlTag::Attribute => semantic_tokens::ATTRIBUTE,
         HlTag::Keyword => lsp_types::SemanticTokenType::KEYWORD,