Rollup merge of #105123 - BlackHoleFox:fixing-the-macos-deployment, r=oli-obk

[rust.git] / src / tools / clippy / clippy_lints / src / returns.rs

diff --git a/src/tools/clippy/clippy_lints/src/returns.rs b/src/tools/clippy/clippy_lints/src/returns.rs
index 2b2a41d160117a5f781cf7d389df8ad550e353d4..81143d7799ea8aa585f2e023b3cb9d3560dfd22f 100644 (file)
--- a/src/tools/clippy/clippy_lints/src/returns.rs
+++ b/src/tools/clippy/clippy_lints/src/returns.rs
@@ -12,6 +12,7 @@
 use rustc_middle::ty::subst::GenericArgKind;
 use rustc_session::{declare_lint_pass, declare_tool_lint};
 use rustc_span::source_map::Span;
+use rustc_span::{BytePos, Pos};
 
 declare_clippy_lint! {
     /// ### What it does
@@ -209,13 +210,14 @@ fn check_final_expr<'tcx>(
             if cx.tcx.hir().attrs(expr.hir_id).is_empty() {
                 let borrows = inner.map_or(false, |inner| last_statement_borrows(cx, inner));
                 if !borrows {
-                    emit_return_lint(
-                        cx,
-                        peeled_drop_expr.span,
-                        semi_spans,
-                        inner.as_ref().map(|i| i.span),
-                        replacement,
-                    );
+                    // check if expr return nothing
+                    let ret_span = if inner.is_none() && replacement == RetReplacement::Empty {
+                        extend_span_to_previous_non_ws(cx, peeled_drop_expr.span)
+                    } else {
+                        peeled_drop_expr.span
+                    };
+
+                    emit_return_lint(cx, ret_span, semi_spans, inner.as_ref().map(|i| i.span), replacement);
                 }
             }
         },
@@ -289,3 +291,16 @@ fn last_statement_borrows<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>)
     })
     .is_some()
 }
+
+// Go backwards while encountering whitespace and extend the given Span to that point.
+fn extend_span_to_previous_non_ws(cx: &LateContext<'_>, sp: Span) -> Span {
+    if let Ok(prev_source) = cx.sess().source_map().span_to_prev_source(sp) {
+        let ws = [' ', '\t', '\n'];
+        if let Some(non_ws_pos) = prev_source.rfind(|c| !ws.contains(&c)) {
+            let len = prev_source.len() - non_ws_pos - 1;
+            return sp.with_lo(sp.lo() - BytePos::from_usize(len));
+        }
+    }
+
+    sp
+}