Produce (slightly) better parser errors

1 files changed, 4 insertions, 4 deletions

diff --git a/pkg/lang/parser/exprs.go b/pkg/lang/parser/exprs.go
index 48d1a8c..1603838 100644
--- a/pkg/lang/parser/exprs.go
+++ b/pkg/lang/parser/exprs.go
@@ -1,7 +1,6 @@
 package parser
 
 import (
-	"fmt"
 	"jinx/pkg/lang/ast"
 	"jinx/pkg/lang/scanner/token"
 )
@@ -207,7 +206,8 @@ func (p *Parser) parseUnitExpr() (ast.Expr, error) {
 	case token.KwTrue, token.KwFalse, token.KwNull, token.KwThis:
 		return p.parseValueLitExpr()
 	default:
-		panic(fmt.Errorf("unexpected token '%v', wanted unit expression start", p.peek().Kind))
+		tok := p.peek()
+		return ast.Expr{}, ErrExpectedUnitExpressionStart{tok.At, tok}
 	}
 }
 
@@ -250,7 +250,7 @@ func (p *Parser) parseFnLitExpr() (ast.Expr, error) {
 	}
 
 	if hasThis {
-		return ast.Expr{}, fmt.Errorf("function literal cannot have 'this' parameter")
+		return ast.Expr{}, ErrFunctionLiteralNoThisAllowed{fnTok.At}
 	}
 
 	// TODO: Also parse just an expression
@@ -406,6 +406,6 @@ func (p *Parser) parseValueLitExpr() (ast.Expr, error) {
 			Value: ast.ExprThis{},
 		}, nil
 	default:
-		panic(fmt.Errorf("unexpected token '%v', wanted value literal", tok))
+		return ast.Expr{}, ErrExpectedValueLiteral{At: tok.At, Got: tok}
 	}
 }