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/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)?,