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I'm a little confused about the location of the test files, `FirLightTreeDiagnosticsTestGenerated` is generated from `compiler/fir/analysis-tests/testData` , while `FirLightTreeOldFrontendDiagnosticsTestGenerated` is generated from `compiler/testData/diagnostics/`.
Is the former(i.e. `FirLightTreeDiagnosticsTestGenerated` ) specifically for K2 frontend and the latter for old frontend test files?   If I want to learn the type inference processing, should I focus on the test files under `compiler/testData/diagnostics/`, which contains more kinds of test files?

Tests in `compiler/testData/diagnostics/` run both for K1 and K2
Tests in `compiler/fir/analysis-tests/testData` run only for K2

&gt; Is the former(i.e. `FirLightTreeDiagnosticsTestGenerated`) specifically for K2 frontend and the latter for old frontend test files?
Yes
`FirLightTreeOldFrontendDiagnosticsTestGenerated` is just a name for K2 tests over testdata which was originally used for K1
Semantically `FirLightTreeOldFrontendDiagnosticsTestGenerated` and `FirLightTreeDiagnosticsTestGenerated` do the same thing