TASTy error on irrelevant stale files

[som-snytt]

Reproduction steps

Scala version: 2.13.8

➜  scalac -d /tmp -Xlint t12591.scala
error: error while loading A, Missing dependency 'Add -Ytasty-reader to scalac options to parse the TASTy in ./A.class', required by ./A.class
t12591.scala:2: warning: type parameter A defined in trait Context shadows class A defined in package <empty>. You may want to rename your type parameter, or possibly remove it.
trait Context[A]
              ^
t12591.scala:5: warning: type parameter A defined in method g shadows class A defined in package <empty>. You may want to rename your type parameter, or possibly remove it.
  def g[A: Context] = f
        ^
2 warnings
1 error

Problem

This is the "stale class file" problem combined with the "random files in current directory" problem.

I've got a self-contained example program, please just compile it. Don't read other files you don't need. Don't eagerly suck up everything on what you assume is the class path.

It's just a coincidence here that the files from a Scala 3 example include A and I have a type parameter A in my example.

➜  ls *.class *.tasty
'A$$anon$2.class'   A.tasty  'C$$anon$1.class'  'C$E$.class'   'Givens$.class'
 A.class            B.class   C.class            C.tasty       'Givens$cOrdering$.class'
'A$.class'          B.tasty  'C$E.class'         Givens.class   Givens.tasty

[SethTisue]

I think it's too late to change the default class path for command-line scalac (to not include .), but if someone wants to make this more robust and/or improve the error message, that would be welcome.

fyi @bishabosha

[som-snytt]

Maybe the error could be a warning. It's nice to know that it couldn't load A, but if I don't care about that, please don't refuse to compile my code.