No errors shown on forwards/backwards compat test failure

[nicolasstucki]

Compiler version

When compiling with test with a file containing the c3.0.0 name, the errors are not reported.

Minimized example

tests/pos/mytest/A_1_c3.0.0.scala

def f: Int = match

tests/pos/mytest/B_2.scala

def test() = f

Output

sbt> testCompilation tests/pos/mytest
...
[info] Test dotty.tools.dotc.CompilationTests.pos started
-- [E006] Not Found Error: tests/pos/mytest/B_2.scala:1:13 ----------------------------------------
1 |def test() = f
  |             ^
  |             Not found: f
Compilation failed for: 'tests/pos/mytest'                    
[=======================================] completed (1/1, 1 failed, 5s)
...

Expectation

The errors of A_1_c3.0.0.scala should be reported to be able to fix them easily. Note that it might be an error that only occurred in that version.