dotty | The Scala 3 compiler , also known as Dotty | Compiler library

I am calling Scala 3's compiler as a library, which gives you CompilationUnit per source after compilation. This has tpdTree, which by the sound of it should contain type information.

I'm trying to walk the tree to get any type symbol as:

Are there any ways to merge two tuples in Scala 2 that is equivalenet to ++ in Scala 3 Tuple - Scala3

I can do this to concatenate two tuples in Scala 3:

I'm trying to make a tool to be able to move the custom model that I created. The first step I did was to display the transform tool and perform the change action. But I can't hover or click the transform tool. Am I missing something in my code?

I am currently doing a lot of compiler research. This not only entails to writing compiler plugins but also modifying the dotty compiler, from the parser to the typer. Therefore I need to constantly look at the raw ASTs to sketch the necessary transformations.

In Scala 2, the reflection library provided the following functionality:

class PEControl[T <: Data : Arithmetic](accType: T), this is a class definition from riscv-gemmini. The Data type is the basic data type in chisel, Arithmetic provides some arithmetic operation on Data, and abstract class Arithmetic[T <: Data].

What is the syntax used for the <: Type : Type, what does this mean? I find that the syntax is called TypeParamBounds ::= TypeBounds {‘:’ Type} from here. Where can I get some detail about it, thanks.

If you follow the steps at the official Scala 3 sites, like Dotty or Scala Lang then it recommends using Coursier to install Scala 3. The problem is that neither or these explain how to run a compiled Scala 3 application after following the steps.

Scala 2:

In Scala 3 it is possible to get the compiler to derive instances of certain typeclasses using the derives TC syntax.

The documentation page here https://dotty.epfl.ch/docs/reference/contextual/derivation.html gives an example of deriving from typeclasses Eq Ordering and Show, saying that these typeclasses are "common examples".

1. Is Show in the library somewhere?
2. If not, is there a typeclass for pretty printing in the standard library?
3. Have I been spoiled by Haskell?

Scala 3's scala.deriving.Mirror has a type member MirroredElemLabels which is a tuple of string literals. What's the standard way to get that type as a value?

EDIT: here's the code that produces a compiler error from trying to use summonAll

(I am new to pyspark) I am trying to read a csv file into a pyspark dataframe as follows: