Macro caching bug

[hejfelix]

Compiler version

3.2.0 (also tested in 3.3.0-RC2)

Minimized code

https://github.com/hejfelix/macro-repro

this repository reproduces the bug. Basically, it seems to be caching the macro output and then failing on incremental compilations. The position and the sourcefile are now undefined (macro doesn't fail, though). The result is then an empty string.

Output

[info] compiling 1 Scala source to /Users/dkFePaHa/repos/macro-repro/target/scala-3.2.0/classes ...
[info] compiling 1 Scala source to /Users/dkFePaHa/repos/macro-repro/target/scala-3.2.0/classes ...
[info] -- Info: /Users/dkFePaHa/repos/macro-repro/src/main/scala/Main.scala:2:69 ------
[info] 2 |  def main(args: Array[String]):Unit = println(SourceMacro.getContent[Foo[?]])
[info]   |                                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[info]   |                   TypeRepr.of[A].typeSymbol.pos: ?, sourceFile: <no file>
[info] running Main

Expectation

The behavior on first and subsequent compilations

[hejfelix]

It could be, that macros are not allowed in the same compilation unit where they're used, but I haven't found this in the documentation.

[hejfelix]

I tried moving the macro into its own module and call it from a different module – same outcome.