Use singletons-th only where possible

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Use singletons-th only where possible #384

Closed mboes closed 2 years ago

mboes commented 2 years ago

Since singletons-3, the TH code has been split off in a separate package. But this new package, singletons-th, only supports GHC>9. So we have to use an older singletons on older compilers.

Original patch by @andreabedini

Fixes #377