From 58b937521f3e459089c0d475551bf9a49f930657 Mon Sep 17 00:00:00 2001
From: Tolmachev Igor <me@igorek.dev>
Date: Fri, 8 May 2026 15:25:55 +0300
Subject: Fold unclosed string error into Token variant

UnclosedString was the only error variant, making lexer::Error redundant. Also removes Result from
the Iterator impl.
---
 compiler/src/lexer/tests.rs | 49 +++++++++++++++++----------------------------
 1 file changed, 18 insertions(+), 31 deletions(-)

(limited to 'compiler/src/lexer/tests.rs')

diff --git a/compiler/src/lexer/tests.rs b/compiler/src/lexer/tests.rs
index 65dd2f2..30be85a 100644
--- a/compiler/src/lexer/tests.rs
+++ b/compiler/src/lexer/tests.rs
@@ -4,7 +4,7 @@ use super::Token::*;
 use super::*;
 
 fn tokenize<'a>(input: &'a str) -> Vec<Token<'a>> {
-    Lexer::new(input).map(|s| s.into_inner().unwrap()).collect()
+    Lexer::new(input).map(|s| s.into_inner()).collect()
 }
 
 #[test]
@@ -102,6 +102,22 @@ fn test_string_escapes() {
     }
 }
 
+#[test]
+fn test_unclosed_strings() {
+    let cases = vec![
+        (r#""abc"#, vec![UnclosedString("abc")]),
+        (r#""abc\""#, vec![UnclosedString(r#"abc\""#)]),
+        ("\"abc\n", vec![UnclosedString("abc")]),
+        ("\"abc\\\ndef", vec![UnclosedString("abc\\\ndef")]),
+        ("\"abc\n\"def\"", vec![UnclosedString("abc"), String("def")]),
+        (r#"""#, vec![UnclosedString("")]),
+        ("\"\n\"", vec![UnclosedString(""), UnclosedString("")]),
+    ];
+    for (code, tokens) in cases {
+        assert_eq!(tokenize(code), tokens);
+    }
+}
+
 #[test]
 fn test_symbols() {
     let cases = vec![
@@ -272,35 +288,6 @@ fn test_comments() {
     }
 }
 
-fn first_error(input: &str) -> Error {
-    Lexer::new(input)
-        .find_map(|s| s.into_inner().err())
-        .expect("error expected")
-}
-
-#[test]
-fn test_unclosed_string_at_eof() {
-    assert_eq!(first_error(r#""abc"#), Error::UnclosedString);
-    assert_eq!(first_error(r#"""#), Error::UnclosedString);
-}
-
-#[test]
-fn test_unclosed_string_with_trailing_escape() {
-    assert_eq!(first_error("\"abc\\"), Error::UnclosedString);
-}
-
-#[test]
-fn test_unclosed_string_with_newline() {
-    assert_eq!(first_error("\"abc\ndef\""), Error::UnclosedString);
-}
-
-#[test]
-fn test_lexer_stops_after_string_error() {
-    let mut lex = Lexer::new(r#""abc"#);
-    assert!(lex.next().unwrap().into_inner().is_err());
-    assert!(lex.next().is_none());
-}
-
 fn spans(input: &str) -> Vec<(Pos, Pos)> {
     Lexer::new(input).map(|s| (s.start(), s.end())).collect()
 }
@@ -324,7 +311,7 @@ fn test_span_after_newline() {
 }
 
 #[test]
-fn test_span_multi_char_() {
+fn test_span_multi_char() {
     let s = spans("foo");
     assert_eq!(s, vec![(Pos::new(1, 0, 0), Pos::new(1, 3, 3))]);
 }
-- 
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