Add a test for the last entry

Author: MarcusGrass

clippy_lints/src/std_instead_of_core.rs

@@ -283,10 +283,9 @@ impl<'tcx> LateLintPass<'tcx> for StdReexports {
 
     }
 
-    #[inline]
-    fn check_item_post(&mut self, cx: &LateContext<'tcx>, item: &'tcx Item<'tcx>) {
-        self.suggest_for_open_use_item_if_after(cx, item.span);
-    }
+    // Essentially, check every other parsable thing's start (except for attributes),
+    // If it starts, wrap up the last path lint. Lookahead would be nice but I don't
+    // know if that's possible.
 
     #[inline]
     fn check_body(&mut self, cx: &LateContext<'tcx>, body: &'tcx Body<'tcx>) {

tests/ui/std_instead_of_core.rs

@@ -117,3 +117,6 @@ fn main() {
     std_instead_of_alloc();
     alloc_instead_of_core();
 }
+
+use std::fmt::{Debug as _, Result as _};
+//~^ ERROR: used import from `std` instead of `core`

tests/ui/std_instead_of_core.stderr

@@ -175,5 +175,11 @@ LL |     use alloc::slice::from_ref;
    = note: `-D clippy::alloc-instead-of-core` implied by `-D warnings`
    = help: to override `-D warnings` add `#[allow(clippy::alloc_instead_of_core)]`
 
-error: aborting due to 24 previous errors
+error: used import from `std` instead of `core`
+  --> tests/ui/std_instead_of_core.rs:121:5
+   |
+LL | use std::fmt::{Debug as _, Result as _};
+   |     ^^^ help: consider importing the item from `core`: `core`
+
+error: aborting due to 25 previous errors