Auto merge of #11589 - koka831:fix/10198, r=giraffate

std_instead_of_core: avoid lint inside of proc-macro

- fixes https://github.com/rust-lang/rust-clippy/issues/10198

note: The lint for the reported `thiserror::Error` has been suppressed by [Don't lint unstable moves in std_instead_of_core](https://github.com/rust-lang/rust-clippy/pull/9545/files#diff-2cb8a24429cf9d9898de901450d640115503a10454d692dddc6a073a299fbb7eR29) because `thiserror::Error`  internally implements `std::error::Error for (derived struct)`.

changelog: [`std_intead_of_core`]: avoid linting inside proc-macro

I confirmed this change fixes the problem:
<details>
<summary>test result without the change</summary>

```console
error: used import from `std` instead of `core`
  --> tests/ui/std_instead_of_core.rs:65:14
   |
LL |     #[derive(ImplStructWithStdDisplay)]
   |              ^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: this error originates in the derive macro `ImplStructWithStdDisplay` (in Nightly builds, run with -Z macro-backtrace for more info)
```
</details>

clippy_lints/src/std_instead_of_core.rs

@@ -1,9 +1,11 @@
 use clippy_utils::diagnostics::span_lint_and_sugg;
+use clippy_utils::is_from_proc_macro;
 use rustc_errors::Applicability;
 use rustc_hir::def::Res;
 use rustc_hir::def_id::DefId;
 use rustc_hir::{HirId, Path, PathSegment};
-use rustc_lint::{LateContext, LateLintPass};
+use rustc_lint::{LateContext, LateLintPass, LintContext};
+use rustc_middle::lint::in_external_macro;
 use rustc_session::{declare_tool_lint, impl_lint_pass};
 use rustc_span::symbol::kw;
 use rustc_span::{sym, Span};
@@ -99,6 +101,8 @@ impl<'tcx> LateLintPass<'tcx> for StdReexports {
         if let Res::Def(_, def_id) = path.res
             && let Some(first_segment) = get_first_segment(path)
             && is_stable(cx, def_id)
+            && !in_external_macro(cx.sess(), path.span)
+            && !is_from_proc_macro(cx, &first_segment.ident)
         {
             let (lint, used_mod, replace_with) = match first_segment.ident.name {
                 sym::std => match cx.tcx.crate_name(def_id.krate) {