Fix record's constructor

Co-authored-by: Guillaume Martres <smarter@users.noreply.github.com>

Author: TheElectronWill

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

@@ -854,7 +854,8 @@ object JavaParsers {
         ).toList
 
       // generate the canonical constructor
-      val canonicalConstructor = makeConstructor(header, tparams)
+      val canonicalConstructor =
+        DefDef(nme.CONSTRUCTOR, joinParams(tparams, List(header)), TypeTree(), EmptyTree).withMods(Modifiers(Flags.JavaDefined, mods.privateWithin))
 
       // return the trees
       val recordTypeDef = atSpan(start, nameOffset) {
@@ -863,7 +864,7 @@ object JavaParsers {
             parents = superclass :: interfaces,
             stats = canonicalConstructor :: accessors ::: body,
             tparams = tparams,
-            false
+            true
           )
         )
       }

compiler/src/dotty/tools/dotc/typer/Typer.scala

@@ -3589,7 +3589,7 @@ class Typer(@constructorOnly nestingLevel: Int = 0) extends Namer
     adapt(tree, pt, ctx.typerState.ownedVars)
 
   private def adapt1(tree: Tree, pt: Type, locked: TypeVars)(using Context): Tree = {
-    assert(pt.exists && !pt.isInstanceOf[ExprType] || ctx.reporter.errorsReported)
+    assert(pt.exists && !pt.isInstanceOf[ExprType] || ctx.reporter.errorsReported, i"tree: $tree, pt: $pt")
     def methodStr = err.refStr(methPart(tree).tpe)
 
     def readapt(tree: Tree)(using Context) = adapt(tree, pt, locked)