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if no suggestion, dont add suggestion

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This commit is contained in:
Corey Farwell 2018-08-29 07:12:22 -05:00
parent f7d1ef90a0
commit 61c20c148e
1 changed files with 10 additions and 11 deletions
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21
clippy_lints/src/ptr_offset_with_cast.rs
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@ -56,14 +56,13 @@ impl<'a, 'tcx> lint::LateLintPass<'a, 'tcx> for Pass {
None => return,
};
utils::span_lint_and_sugg(
cx,
PTR_OFFSET_WITH_CAST,
expr.span,
"use of `offset` with a `usize` casted to an `isize`",
"try",
build_suggestion(cx, receiver_expr, cast_lhs_expr),
);
let msg = "use of `offset` with a `usize` casted to an `isize`";
if let Some(sugg) = build_suggestion(cx, receiver_expr, cast_lhs_expr) {
utils::span_lint_and_sugg(cx, PTR_OFFSET_WITH_CAST, expr.span, msg, "try", sugg);
} else {
utils::span_lint(cx, PTR_OFFSET_WITH_CAST, expr.span, msg);
}
}
}
@ -114,12 +113,12 @@ fn build_suggestion<'a, 'tcx>(
cx: &lint::LateContext<'a, 'tcx>,
receiver_expr: &hir::Expr,
cast_lhs_expr: &hir::Expr,
) -> String {
) -> Option<String> {
match (
utils::snippet_opt(cx, receiver_expr.span),
utils::snippet_opt(cx, cast_lhs_expr.span)
) {
(Some(receiver), Some(cast_lhs)) => format!("{}.add({})", receiver, cast_lhs),
_ => String::new(),
(Some(receiver), Some(cast_lhs)) => Some(format!("{}.add({})", receiver, cast_lhs)),
_ => None,
}
}