Various fixes for manual_is_power_of_two
#14463
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r? clippy |
This is a refactoring of the existing code to remove repetitive code.
Since the fixed expression is used as a receiver for `.is_power_of_two()`, it may require parentheses.
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| ); | ||
| /// Return the unsigned integer receiver of `.count_ones()` | ||
| fn count_ones_receiver<'tcx>(cx: &LateContext<'tcx>, expr: &Expr<'tcx>) -> Option<&'tcx Expr<'tcx>> { | ||
| if let ExprKind::MethodCall(method_name, receiver, [], _) = expr.kind |
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This could also check for <int>::count_ones(x), it's a normal ExprKind::Call.
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Good catch. Done, and tested, in a new commit on top of the others.
| if let ExprKind::Binary(op, lhs, rhs) = smaller.kind | ||
| && !lhs.span.from_expansion() | ||
| && !rhs.span.from_expansion() | ||
| && op.node == BinOpKind::Sub |
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Could we move this op.node == BinOpKind::Sub to above the expansion checking?
Also, thinking about checking for expansion so many times, we could probably minimize some of these (as we check for expansions 3 times before linting)
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Right! All checks are necessary, but I've factored them in through a helper function. This makes code easier to read. The modified commit is Do not lint result from macro expansion.
If parts of the expression comes from macro expansion, it may match an expression equivalent to `is_power_of_two()` by chance only.
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Fix #14461:
constcontextCommits have been logically separated to facilitate review, and start with a refactoring (and simplification) of the existing code.
changelog: [
manual_is_power_of_two]: insert parentheses as required in suggestion, check MSRV before suggesting fix inconstcontext, do not lint macro expansion results