Scala3doc: document stdlib together with Dotty extensions

Author: abgruszecki

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

@@ -299,6 +299,12 @@ trait TypeAssigner {
           else fntpe.resultType
         else
           errorType(i"wrong number of arguments at ${ctx.phase.prev} for $fntpe: ${fn.tpe}, expected: ${fntpe.paramInfos.length}, found: ${args.length}", tree.srcPos)
+      case t if args.isEmpty =>
+        // NOTE this case was necessary when unpickling code from Tasty that was compiled referencing, say, `def toString()`
+        // (which gets a MethodType) and which is unpickled with a different version of the same definition seen as
+        // `def toString` (which gets an ExprType). This is an unusual situation that happened with stdlib+Dotty's extensions to it,
+        // when stdlib and said extensions were separate projects.
+        t
       case t =>
         if (ctx.settings.Ydebug.value) new FatalError("").printStackTrace()
         errorType(err.takesNoParamsStr(fn, ""), tree.srcPos)

project/Build.scala

@@ -1555,6 +1555,7 @@ object Build {
 
           generateScala3StdlibDocumentation:= Def.taskDyn {
             val dottyJars: Seq[java.io.File] = Seq(
+              (`scala3-library-bootstrapped`/Compile/products).value,
               (`stdlib-bootstrapped`/Compile/products).value,
             ).flatten