syntax_data: {"ast_node_type":"other","tokens":[{"end":72,"kind":"keyword","start":0,"text":".filter(|elem|"}]}
source_snippet:         .filter(|elem| !matches!(elem, ProjectionElem::OpaqueCast(..)));
context_before:         // Filter out opaque casts, they are unnecessary in the prefix.
context_after:     for projection in prefix_projections {