Auto merge of rust-lang#11609 - y21:get_first_non_primitives, r=giraffate

[`get_first`]: lint on non-primitive slices

Fixes rust-lang#11594

I left the issue open for a couple days before making the PR to see if anyone has something to say, but it looks like there aren't any objections to removing this check that prevented linting on non-primitive slices, so here's the PR now.
There's a couple of instances in clippy itself where we now emit the lint. The actual relevant change is in the first commit and fixing the `.get(0)` instances in clippy itself is in the 2nd commit.

changelog: [`get_first`]: lint on non-primitive slices

Author: bors

clippy_lints/src/loops/same_item_push.rs

@@ -185,7 +185,7 @@ fn get_vec_push<'tcx>(
             if let StmtKind::Semi(semi_stmt) = &stmt.kind;
             if let ExprKind::MethodCall(path, self_expr, args, _) = &semi_stmt.kind;
             // Figure out the parameters for the method call
-            if let Some(pushed_item) = args.get(0);
+            if let Some(pushed_item) = args.first();
             // Check that the method being called is push() on a Vec
             if is_type_diagnostic_item(cx, cx.typeck_results().expr_ty(self_expr), sym::Vec);
             if path.ident.name.as_str() == "push";

clippy_lints/src/manual_bits.rs

@@ -103,9 +103,9 @@ fn get_size_of_ty<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>) -> Option<
         if let ExprKind::Path(ref count_func_qpath) = count_func.kind;
 
         if let QPath::Resolved(_, count_func_path) = count_func_qpath;
-        if let Some(segment_zero) = count_func_path.segments.get(0);
+        if let Some(segment_zero) = count_func_path.segments.first();
         if let Some(args) = segment_zero.args;
-        if let Some(GenericArg::Type(real_ty)) = args.args.get(0);
+        if let Some(GenericArg::Type(real_ty)) = args.args.first();
 
         if let Some(def_id) = cx.qpath_res(count_func_qpath, count_func.hir_id).opt_def_id();
         if cx.tcx.is_diagnostic_item(sym::mem_size_of, def_id);

clippy_lints/src/methods/get_first.rs

@@ -1,5 +1,4 @@
 use clippy_utils::diagnostics::span_lint_and_sugg;
-use clippy_utils::is_slice_of_primitives;
 use clippy_utils::source::snippet_with_applicability;
 use if_chain::if_chain;
 use rustc_ast::LitKind;
@@ -20,7 +19,6 @@ pub(super) fn check<'tcx>(
         if let Some(method_id) = cx.typeck_results().type_dependent_def_id(expr.hir_id);
         if let Some(impl_id) = cx.tcx.impl_of_method(method_id);
         if cx.tcx.type_of(impl_id).instantiate_identity().is_slice();
-        if let Some(_) = is_slice_of_primitives(cx, recv);
         if let hir::ExprKind::Lit(Spanned { node: LitKind::Int(0, _), .. }) = arg.kind;
         then {
             let mut app = Applicability::MachineApplicable;

clippy_lints/src/methods/search_is_some.rs

@@ -39,7 +39,7 @@ pub(super) fn check<'tcx>(
                 if search_method == "find";
                 if let hir::ExprKind::Closure(&hir::Closure { body, .. }) = search_arg.kind;
                 let closure_body = cx.tcx.hir().body(body);
-                if let Some(closure_arg) = closure_body.params.get(0);
+                if let Some(closure_arg) = closure_body.params.first();
                 then {
                     if let hir::PatKind::Ref(..) = closure_arg.pat.kind {
                         Some(search_snippet.replacen('&', "", 1))

clippy_lints/src/missing_doc.rs

@@ -67,7 +67,7 @@ impl MissingDoc {
         if_chain! {
             if let Some(meta) = meta;
             if let MetaItemKind::List(list) = meta.kind;
-            if let Some(meta) = list.get(0);
+            if let Some(meta) = list.first();
             if let Some(name) = meta.ident();
             then {
                 name.name == sym::include

clippy_lints/src/needless_continue.rs

@@ -189,7 +189,7 @@ fn needless_continue_in_else(else_expr: &ast::Expr, label: Option<&ast::Label>)
 }
 
 fn is_first_block_stmt_continue(block: &ast::Block, label: Option<&ast::Label>) -> bool {
-    block.stmts.get(0).map_or(false, |stmt| match stmt.kind {
+    block.stmts.first().map_or(false, |stmt| match stmt.kind {
         ast::StmtKind::Semi(ref e) | ast::StmtKind::Expr(ref e) => {
             if let ast::ExprKind::Continue(ref l) = e.kind {
                 compare_labels(label, l.as_ref())
@@ -434,7 +434,7 @@ fn erode_from_back(s: &str) -> String {
 }
 
 fn span_of_first_expr_in_block(block: &ast::Block) -> Option<Span> {
-    block.stmts.get(0).map(|stmt| stmt.span)
+    block.stmts.first().map(|stmt| stmt.span)
 }
 
 #[cfg(test)]

clippy_lints/src/slow_vector_initialization.rs

@@ -335,7 +335,7 @@ impl<'a, 'tcx> Visitor<'tcx> for VectorInitializationVisitor<'a, 'tcx> {
 
     fn visit_block(&mut self, block: &'tcx Block<'_>) {
         if self.initialization_found {
-            if let Some(s) = block.stmts.get(0) {
+            if let Some(s) = block.stmts.first() {
                 self.visit_stmt(s);
             }
 

clippy_lints/src/uninit_vec.rs

@@ -201,7 +201,7 @@ fn extract_set_len_self<'tcx>(cx: &LateContext<'_>, expr: &'tcx Expr<'_>) -> Opt
     let expr = peel_hir_expr_while(expr, |e| {
         if let ExprKind::Block(block, _) = e.kind {
             // Extract the first statement/expression
-            match (block.stmts.get(0).map(|stmt| &stmt.kind), block.expr) {
+            match (block.stmts.first().map(|stmt| &stmt.kind), block.expr) {
                 (None, Some(expr)) => Some(expr),
                 (Some(StmtKind::Expr(expr) | StmtKind::Semi(expr)), _) => Some(expr),
                 _ => None,

clippy_lints/src/unnecessary_map_on_constructor.rs

@@ -40,7 +40,7 @@ impl<'tcx> LateLintPass<'tcx> for UnnecessaryMapOnConstructor {
             let (constructor_path, constructor_item) =
                 if let hir::ExprKind::Call(constructor, constructor_args) = recv.kind
                     && let hir::ExprKind::Path(constructor_path) = constructor.kind
-                    && let Some(arg) = constructor_args.get(0)
+                    && let Some(arg) = constructor_args.first()
                 {
                     if constructor.span.from_expansion() || arg.span.from_expansion() {
                         return;
@@ -66,7 +66,7 @@ impl<'tcx> LateLintPass<'tcx> for UnnecessaryMapOnConstructor {
                 _ => return,
             }
 
-            if let Some(map_arg) = args.get(0)
+            if let Some(map_arg) = args.first()
                 && let hir::ExprKind::Path(fun) = map_arg.kind
             {
                 if map_arg.span.from_expansion() {

clippy_utils/src/consts.rs

@@ -504,7 +504,7 @@ impl<'a, 'tcx> ConstEvalLateContext<'a, 'tcx> {
             },
             (Some(Constant::Vec(vec)), _) => {
                 if !vec.is_empty() && vec.iter().all(|x| *x == vec[0]) {
-                    match vec.get(0) {
+                    match vec.first() {
                         Some(Constant::F32(x)) => Some(Constant::F32(*x)),
                         Some(Constant::F64(x)) => Some(Constant::F64(*x)),
                         _ => None,

clippy_utils/src/higher.rs

@@ -449,7 +449,7 @@ pub fn get_vec_init_kind<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'tcx>) -
                 } else if name.ident.name == symbol::kw::Default {
                     return Some(VecInitKind::Default);
                 } else if name.ident.name.as_str() == "with_capacity" {
-                    let arg = args.get(0)?;
+                    let arg = args.first()?;
                     return match constant_simple(cx, cx.typeck_results(), arg) {
                         Some(Constant::Int(num)) => Some(VecInitKind::WithConstCapacity(num)),
                         _ => Some(VecInitKind::WithExprCapacity(arg.hir_id)),

tests/ui/get_first.fixed

@@ -14,17 +14,20 @@ impl Bar {
 
 fn main() {
     let x = vec![2, 3, 5];
-    let _ = x.first(); // Use x.first()
+    let _ = x.first();
+    //~^ ERROR: accessing first element with `x.get(0)`
     let _ = x.get(1);
     let _ = x[0];
 
     let y = [2, 3, 5];
-    let _ = y.first(); // Use y.first()
+    let _ = y.first();
+    //~^ ERROR: accessing first element with `y.get(0)`
     let _ = y.get(1);
     let _ = y[0];
 
     let z = &[2, 3, 5];
-    let _ = z.first(); // Use z.first()
+    let _ = z.first();
+    //~^ ERROR: accessing first element with `z.get(0)`
     let _ = z.get(1);
     let _ = z[0];
 
@@ -37,4 +40,8 @@ fn main() {
 
     let bar = Bar { arr: [0, 1, 2] };
     let _ = bar.get(0); // Do not lint, because Bar is struct.
+
+    let non_primitives = [vec![1, 2], vec![3, 4]];
+    let _ = non_primitives.first();
+    //~^ ERROR: accessing first element with `non_primitives.get(0)`
 }

tests/ui/get_first.rs

@@ -14,17 +14,20 @@ impl Bar {
 
 fn main() {
     let x = vec![2, 3, 5];
-    let _ = x.get(0); // Use x.first()
+    let _ = x.get(0);
+    //~^ ERROR: accessing first element with `x.get(0)`
     let _ = x.get(1);
     let _ = x[0];
 
     let y = [2, 3, 5];
-    let _ = y.get(0); // Use y.first()
+    let _ = y.get(0);
+    //~^ ERROR: accessing first element with `y.get(0)`
     let _ = y.get(1);
     let _ = y[0];
 
     let z = &[2, 3, 5];
-    let _ = z.get(0); // Use z.first()
+    let _ = z.get(0);
+    //~^ ERROR: accessing first element with `z.get(0)`
     let _ = z.get(1);
     let _ = z[0];
 
@@ -37,4 +40,8 @@ fn main() {
 
     let bar = Bar { arr: [0, 1, 2] };
     let _ = bar.get(0); // Do not lint, because Bar is struct.
+
+    let non_primitives = [vec![1, 2], vec![3, 4]];
+    let _ = non_primitives.get(0);
+    //~^ ERROR: accessing first element with `non_primitives.get(0)`
 }

tests/ui/get_first.stderr

@@ -1,23 +1,29 @@
 error: accessing first element with `x.get(0)`
   --> $DIR/get_first.rs:17:13
    |
-LL |     let _ = x.get(0); // Use x.first()
+LL |     let _ = x.get(0);
    |             ^^^^^^^^ help: try: `x.first()`
    |
    = note: `-D clippy::get-first` implied by `-D warnings`
    = help: to override `-D warnings` add `#[allow(clippy::get_first)]`
 
 error: accessing first element with `y.get(0)`
-  --> $DIR/get_first.rs:22:13
+  --> $DIR/get_first.rs:23:13
    |
-LL |     let _ = y.get(0); // Use y.first()
+LL |     let _ = y.get(0);
    |             ^^^^^^^^ help: try: `y.first()`
 
 error: accessing first element with `z.get(0)`
-  --> $DIR/get_first.rs:27:13
+  --> $DIR/get_first.rs:29:13
    |
-LL |     let _ = z.get(0); // Use z.first()
+LL |     let _ = z.get(0);
    |             ^^^^^^^^ help: try: `z.first()`
 
-error: aborting due to 3 previous errors
+error: accessing first element with `non_primitives.get(0)`
+  --> $DIR/get_first.rs:45:13
+   |
+LL |     let _ = non_primitives.get(0);
+   |             ^^^^^^^^^^^^^^^^^^^^^ help: try: `non_primitives.first()`
+
+error: aborting due to 4 previous errors