From 66e3080173cdc996a6548004eb46a13ae35f0dca Mon Sep 17 00:00:00 2001
From: Jeong YunWon <jeong@youknowone.org>
Date: Wed, 22 Feb 2023 16:52:40 +0900
Subject: [PATCH] Fix ModeParseError message

---
 core/src/mode.rs   | 8 +++-----
 parser/src/mode.rs | 8 +++-----
 2 files changed, 6 insertions(+), 10 deletions(-)

diff --git a/core/src/mode.rs b/core/src/mode.rs
index b56f226..ca0d599 100644
--- a/core/src/mode.rs
+++ b/core/src/mode.rs
@@ -15,18 +15,16 @@ impl std::str::FromStr for Mode {
             "exec" => Ok(Mode::Exec),
             "eval" => Ok(Mode::Eval),
             "single" => Ok(Mode::Single),
-            _ => Err(ModeParseError { _priv: () }),
+            _ => Err(ModeParseError(())),
         }
     }
 }
 
 #[derive(Debug)]
-pub struct ModeParseError {
-    _priv: (),
-}
+pub struct ModeParseError(());
 
 impl std::fmt::Display for ModeParseError {
     fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
-        write!(f, r#"mode should be "exec", "eval", or "single""#)
+        write!(f, r#"mode must be "exec", "eval", or "single""#)
     }
 }
diff --git a/parser/src/mode.rs b/parser/src/mode.rs
index 4403fbe..9e9f1e1 100644
--- a/parser/src/mode.rs
+++ b/parser/src/mode.rs
@@ -39,19 +39,17 @@ impl std::str::FromStr for Mode {
         match s {
             "exec" | "single" => Ok(Mode::Module),
             "eval" => Ok(Mode::Expression),
-            _ => Err(ModeParseError { _priv: () }),
+            _ => Err(ModeParseError(())),
         }
     }
 }
 
 /// Returned when a given mode is not valid.
 #[derive(Debug)]
-pub struct ModeParseError {
-    _priv: (),
-}
+pub struct ModeParseError(());
 
 impl std::fmt::Display for ModeParseError {
     fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
-        write!(f, r#"mode should be "exec", "eval", or "single""#)
+        write!(f, r#"mode must be "exec", "eval", or "single""#)
     }
 }