conlang: Add Quote expression as a hack for testing

Possibly removed later, or replaced with something that turns Conlang AST nodes into Conlang data structures.

compiler/cl-parser/src/parser.rs

@@ -900,6 +900,18 @@ impl Parse<'_> for ExprKind {
     }
 }
 
+impl Parse<'_> for Quote {
+    fn parse(p: &mut Parser<'_>) -> PResult<Self> {
+        let quote = delim(
+            ExprKind::parse,
+            (TokenKind::Grave, TokenKind::Grave),
+            Parsing::ExprKind,
+        )(p)?
+        .into();
+        Ok(Quote { quote })
+    }
+}
+
 impl Parse<'_> for Let {
     fn parse(p: &mut Parser) -> PResult<Let> {
         p.consume_peeked();

compiler/cl-parser/src/parser/prec.rs

@@ -16,6 +16,7 @@ pub fn exprkind(p: &mut Parser, power: u8) -> PResult<ExprKind> {
         literal_like!() => Literal::parse(p)?.into(),
         path_like!() => exprkind_pathlike(p)?,
         TokenKind::Amp | TokenKind::AmpAmp => AddrOf::parse(p)?.into(),
+        TokenKind::Grave => Quote::parse(p)?.into(),
         TokenKind::LCurly => Block::parse(p)?.into(),
         TokenKind::LBrack => exprkind_arraylike(p)?,
         TokenKind::LParen => exprkind_tuplelike(p)?,