Fix #4934: Issue an error in acceptStatSepUnlessAtEnd

compiler/src/dotty/tools/dotc/parsing/Parsers.scala

@@ -341,6 +341,7 @@ object Parsers {
           case NEWLINE | NEWLINES => in.nextToken()
           case SEMI => in.nextToken()
           case _ =>
+            syntaxError("end of statement expected")
             in.nextToken() // needed to ensure progress; otherwise we might cycle forever
             accept(SEMI)
         }

tests/neg/i1779.scala

@@ -8,6 +8,6 @@ object Test {
   def f = {
     val _parent = 3
     q"val hello = $_parent"
-    q"class $_" // error
+    q"class $_" // error // error
   } // error
 }

tests/neg/i4934.scala

@@ -0,0 +1,10 @@
+object Foo {
+  val a = ""); // error: end of statement expected
+}
+// From #5824:
+object Main {
+  def main(args: Array[String]): Unit = {
+    val foo = 123 ""; // error: end of statement expected
+    println(foo)
+  }
+}

tests/neg/parser-stability-16.scala

@@ -2,5 +2,5 @@ class x0[x0] {
   val x1 : x0
 }
 trait x3 extends x0 { // error
-x1 = 0 object  // error
+x1 = 0 object  // error // error
 // error

tests/neg/parser-stability-17.scala

@@ -1,2 +1,2 @@
 trait x0[] {      x0: x0 => }      // error // error
-        class x0[x1] extends x0[x0 x0] x2 x0  // error // error
+        class x0[x1] extends x0[x0 x0] x2 x0  // error // error // error

tests/neg/parser-stability-23.scala

@@ -1,3 +1,3 @@
 object i0 {
-  import Ordering.{ implicitly => } (true: Boolean) match { case _: i1 => true } // error // error
+  import Ordering.{ implicitly => } (true: Boolean) match { case _: i1 => true } // error // error // error
 }

tests/neg/parser-stability-4.scala

@@ -1,3 +1,3 @@
 class x0{
-      def x0: x0 = (x0 => x0) => x0)  // error
+      def x0: x0 = (x0 => x0) => x0)  // error // error
 // error

tests/run/weak-conformance.scala

@@ -42,12 +42,12 @@ object Test extends App {
   locally {
     def f(): Int = b + 1
     val x1 = if (true) b else if (true) 33 else 5.5    ; x1: Double // b is an inline val
-    val x2 = if (true) f() else if (true) 33 else 5.5) ; x2: AnyVal // f() is not a constant
-    val x3 = if (true) 5 else 11L)                     ; x3: Long
-    val x4 = if (true) 5 else if (true) 11L else 5.5)  ; x4: AnyVal // Long and Double found
-    val x5 = if (true) 1.0f else 2)                    ; x5: Float
-    val x6 = if (true) 1.0f else 1234567890)           ; x6: AnyVal // loss of precision
-    val x7 = if (true) b else if (true) 33 else 'a')   ; x7: Char
-    val x8 = if (true) 5.toByte else 11)               ; x8: Byte
+    val x2 = if (true) f() else if (true) 33 else 5.5  ; x2: AnyVal // f() is not a constant
+    val x3 = if (true) 5 else 11L                      ; x3: Long
+    val x4 = if (true) 5 else if (true) 11L else 5.5   ; x4: AnyVal // Long and Double found
+    val x5 = if (true) 1.0f else 2                     ; x5: Float
+    val x6 = if (true) 1.0f else 1234567890            ; x6: AnyVal // loss of precision
+    val x7 = if (true) b else if (true) 33 else 'a'    ; x7: Char
+    val x8 = if (true) 5.toByte else 11                ; x8: Byte
   }
 }