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fix: show deprecated syntax warning in more places - #15813
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This PR makes the "deprecated syntax" linter report in places it previously missed.
This was largely due to elaborators doing their own macro expansion, like the
binop%/binrel%elaborators,donotation, etc. The necessary check is now exposed as a reusable functionLean.Elab.Term.expandMacroReportingDeprecated?, and the docstring ofexpandMacroImpl?mentions this.