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0b3011a041
The `{expr}.map(p -> tpl)` and `{expr}.reduce_left(first -> init, acc,
elem -> fold)` post-fix chains on `{expr}` placeholders had no
remaining users in the codebase: `.map` was never used, and the
4 `.reduce_left` sites in `swift.rs` were rewritten to plain
`Iterator::reduce` via an `and_chain` helper in an earlier commit.
Removes the entire `parse_chain_suffix` function (~90 lines) and the
`has_chain` detection / dispatch branches at the two call sites
(field-position in `parse_direct_node_inner` and body-position in
`parse_direct_list`). The remaining `{expr}` path is the
trait-dispatched one introduced by the splice-syntax cleanup, which
handles single ids and iterables uniformly via `IntoFieldIds`.
Also strips the chain syntax from the `tree!` macro doc comment.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>