Prevent exponentially large type sizes in tuple_combinations
#945
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This slightly improves the performance of
cargo build --release
on stable, and prevents a hang1 when using the next-generation trait solver-Znext-solver
.Long term such manually optimizations should be unnecessary, but for now it unfortunately requires some manual effort.
Footnotes
it would finish at some point, but the sun will have probably consumed the earth before then ↩