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Use array slice instead of `Vec` in `find_macro_calls` as suggested by @ebroto

Co-authored-by: Eduardo Broto <ebroto@tutanota.com>

clippy_lints/src/panic_in_result_fn.rs

@@ -53,7 +53,7 @@ impl<'tcx> LateLintPass<'tcx> for PanicInResultFn {
 
 fn lint_impl_body<'tcx>(cx: &LateContext<'tcx>, impl_span: Span, body: &'tcx hir::Body<'tcx>) {
     let panics = find_macro_calls(
-        vec![
+        &[
             "unimplemented",
             "unreachable",
             "panic",

clippy_lints/src/utils/mod.rs

@@ -602,8 +602,8 @@ pub fn contains_return(expr: &hir::Expr<'_>) -> bool {
     visitor.found
 }
 
-struct FindMacroCalls<'a> {
-    names: Vec<&'a str>,
+struct FindMacroCalls<'a, 'b> {
+    names: &'a [&'b str],
     result: Vec<Span>,
 }
 
@@ -624,7 +624,7 @@ impl<'a, 'tcx> Visitor<'tcx> for FindMacroCalls<'a> {
 }
 
 /// Finds calls of the specified macros in a function body.
-pub fn find_macro_calls(names: Vec<&str>, body: &'tcx Body<'tcx>) -> Vec<Span> {
+pub fn find_macro_calls(names: &[&str], body: &Body<'_>) -> Vec<Span> {
     let mut fmc = FindMacroCalls {
         names,
         result: Vec::new(),