From 0a23d453a0c019e6b3a31da7d862dcfbbde2c664 Mon Sep 17 00:00:00 2001
From: Eduardo Lopez <252504+tapichu@users.noreply.github.com>
Date: Sat, 21 Mar 2020 17:23:56 -0700
Subject: [PATCH] Use *lexer.describe in parse error message

Make error messages for tokens like EOF, Ident, Int or Float easier to
understand.
---
 ch7/eval/parse.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ch7/eval/parse.go b/ch7/eval/parse.go
index e68f8f534..accd57083 100644
--- a/ch7/eval/parse.go
+++ b/ch7/eval/parse.go
@@ -130,7 +130,7 @@ func parsePrimary(lex *lexer) Expr {
 				lex.next() // consume ','
 			}
 			if lex.token != ')' {
-				msg := fmt.Sprintf("got %q, want ')'", lex.token)
+				msg := fmt.Sprintf("got %s, want ')'", lex.describe())
 				panic(lexPanic(msg))
 			}
 		}