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lihaoyi · lihaoyi · commit b753383a8c0d · 2025-10-28T08:21:27.000+08:00
diff --git a/compiler/src/dotty/tools/dotc/parsing/Parsers.scala b/compiler/src/dotty/tools/dotc/parsing/Parsers.scala
@@ -1468,7 +1468,7 @@ object Parsers {
               // Check if this is a dedented string (non-interpolated)
               // For non-interpolated dedented strings, check if the token starts with '''
               val str = in.strVal
-              if (token == STRINGLIT && !inStringInterpolation && isDedentedStringLiteral(negOffset)) {
+              if (str != null && token == STRINGLIT && !inStringInterpolation && isDedentedStringLiteral(negOffset)) {
                 extractClosingIndent(str, negOffset) match {
                   case Some(closingIndent) => dedentString(str, negOffset, closingIndent, true, true)
                   case None => str
diff --git a/compiler/src/dotty/tools/dotc/parsing/Scanners.scala b/compiler/src/dotty/tools/dotc/parsing/Scanners.scala
@@ -1292,6 +1292,11 @@ object Scanners {
       }
 
       // Must be followed by a newline
+      if (ch == SU) {
+        incompleteInputError(em"unclosed dedented string literal")
+        token = STRINGLIT
+        return 0
+      }
       if (ch != LF && ch != CR) {
         error(em"dedented string literal must start with newline after opening quotes")
         token = ERROR
