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4be8c49cdc
mbe: Refactors and function extractions in `compile_declarative_macro` These refactors help pave the way for parsing attribute rules. Best reviewed commit-by-commit. - **mbe: Simplify compile_declarative_macro by factoring out some variables** - **mbe: Factor out a helper to check an LHS** - **mbe: Factor out a helper to check for unexpected EOF in definition** - **mbe: Clarify comments about error handling in `compile_declarative_macro`**