f9078a40ee
Actually parse async gen blocks correctly
1. I got the control flow in `parse_expr_bottom` messed up, and obviously forgot a test for `async gen`, so we weren't actually ever parsing it correctly.
2. I forgot to gate the span for `async gen {}`, so even if we did parse it, we wouldn't have correctly denied it in `cfg(FALSE)`.
r? eholk
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|---|---|---|
| .. | ||
| attr.rs | ||
| attr_wrapper.rs | ||
| diagnostics.rs | ||
| expr.rs | ||
| generics.rs | ||
| item.rs | ||
| mod.rs | ||
| nonterminal.rs | ||
| pat.rs | ||
| path.rs | ||
| stmt.rs | ||
| ty.rs | ||