Fix keeping generics that are unavailable in the current context (#322) #1614

All 2 002 tests pass, 1 skipped in 2m 17s

    27 files ±0     27 suites ±0 2m 17s ⏱️ -20s
2 003 tests ±0 2 002 ✔️ ±0 1 💤 ±0 0 ❌ ±0
3 711 runs ±0 3 708 ✔️ ±0 3 💤 ±0 0 ❌ ±0

Results for commit 55e3b70. ± Comparison against earlier commit 392a8f6.