fix: don't silently drop an unterminated multiline value

src/Parser/Lines.php

@@ -43,6 +43,14 @@ public static function process(array $lines)
             }
         }
 
+        // If the input ends while still inside a multiline value, the value
+        // was never closed. Emit the buffered content as a final entry
+        // instead of silently discarding it, so the parser reports the same
+        // missing-closing-quote error the single-quoted case already does.
+        if ($multiline && $multilineBuffer !== []) {
+            $output[] = \implode("\n", $multilineBuffer);
+        }
+
         return $output;
     }
 

tests/Dotenv/Parser/LinesTest.php

@@ -50,4 +50,20 @@ public function testProcessQuotes()
 
         self::assertSame($expected, Lines::process($result->success()->get()));
     }
+
+    public function testProcessUnterminatedMultilineIsEmittedNotDropped()
+    {
+        $result = Regex::split("/(\r\n|\n|\r)/", "FOO=\"bar");
+        self::assertTrue($result->success()->isDefined());
+
+        self::assertSame(['FOO="bar'], Lines::process($result->success()->get()));
+    }
+
+    public function testProcessUnterminatedMultilineDoesNotSwallowFollowingLines()
+    {
+        $result = Regex::split("/(\r\n|\n|\r)/", "A=\"oops\nB=keep");
+        self::assertTrue($result->success()->isDefined());
+
+        self::assertSame(["A=\"oops\nB=keep"], Lines::process($result->success()->get()));
+    }
 }