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ecc550eb53
When running sourcekit-lsp’s tests using Xcode 15, they fail because the sourcekitd in Xcode 15 does not contain the semantic tokens request. The intended workaround/fix is to dowload a recent Swift development snapshot from swift.org and set it as `SOURCEKIT_TOOLCHAIN_PATH` when running tests. But that’s not a great experience for new contributors. Instead, if sourcekitd doesn’t support the semantic tokens request, simply skip the test. This also changes the implementation of the semantic tokens LSP request slightly: When the sourcekitd request to get semantic tokens fails, we now fail the entire LSP request, instead of returning the tokens from the synax tree. I think that’s reasonable because the editor did ask for semantic tokens, not syntactic tokens. Fixes #940 rdar://117590581