Auto merge of #54850 - mcr431:fix-54707-trait-function-from-macro, r=nikomatsakis

Fix #54707 - parse_trait_item_ now handles interpolated blocks as function body decls

Fix #54707 - parse_trait_item_ now handles interpolated blocks as function body decls

Previously parsing trait items only handled opening brace token and semicolon, I added a branch to the match statement that will also handle interpolated blocks.

diff --cc src/libsyntax/parse/parser.rs
Simple merge