Adding upstream version 1.64.0+dfsg1.upstream/1.64.0+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

16 files changed, 524 insertions, 0 deletions

diff --git a/src/tools/clippy/tests/ui/author/blocks.rs b/src/tools/clippy/tests/ui/author/blocks.rs
new file mode 100644
index 000000000..a7335c01b
--- /dev/null
+++ b/src/tools/clippy/tests/ui/author/blocks.rs
@@ -0,0 +1,24 @@
+// edition:2018
+
+#![allow(redundant_semicolons, clippy::no_effect)]
+#![feature(stmt_expr_attributes)]
+#![feature(async_closure)]
+
+#[rustfmt::skip]
+fn main() {
+    #[clippy::author]
+    {
+        let x = 42i32;
+        let _t = 1f32;
+
+        -x;
+    };
+    #[clippy::author]
+    {
+        let expr = String::new();
+        drop(expr)
+    };
+
+    #[clippy::author]
+    async move || {};
+}
diff --git a/src/tools/clippy/tests/ui/author/blocks.stdout b/src/tools/clippy/tests/ui/author/blocks.stdout
new file mode 100644
index 000000000..2fc4a7d1f
--- /dev/null
+++ b/src/tools/clippy/tests/ui/author/blocks.stdout
@@ -0,0 +1,64 @@
+if_chain! {
+    if let ExprKind::Block(block, None) = expr.kind;
+    if block.stmts.len() == 3;
+    if let StmtKind::Local(local) = block.stmts[0].kind;
+    if let Some(init) = local.init;
+    if let ExprKind::Lit(ref lit) = init.kind;
+    if let LitKind::Int(42, LitIntType::Signed(IntTy::I32)) = lit.node;
+    if let PatKind::Binding(BindingAnnotation::Unannotated, _, name, None) = local.pat.kind;
+    if name.as_str() == "x";
+    if let StmtKind::Local(local1) = block.stmts[1].kind;
+    if let Some(init1) = local1.init;
+    if let ExprKind::Lit(ref lit1) = init1.kind;
+    if let LitKind::Float(_, LitFloatType::Suffixed(FloatTy::F32)) = lit1.node;
+    if let PatKind::Binding(BindingAnnotation::Unannotated, _, name1, None) = local1.pat.kind;
+    if name1.as_str() == "_t";
+    if let StmtKind::Semi(e) = block.stmts[2].kind;
+    if let ExprKind::Unary(UnOp::Neg, inner) = e.kind;
+    if let ExprKind::Path(ref qpath) = inner.kind;
+    if match_qpath(qpath, &["x"]);
+    if block.expr.is_none();
+    then {
+        // report your lint here
+    }
+}
+if_chain! {
+    if let ExprKind::Block(block, None) = expr.kind;
+    if block.stmts.len() == 1;
+    if let StmtKind::Local(local) = block.stmts[0].kind;
+    if let Some(init) = local.init;
+    if let ExprKind::Call(func, args) = init.kind;
+    if let ExprKind::Path(ref qpath) = func.kind;
+    if match_qpath(qpath, &["String", "new"]);
+    if args.is_empty();
+    if let PatKind::Binding(BindingAnnotation::Unannotated, _, name, None) = local.pat.kind;
+    if name.as_str() == "expr";
+    if let Some(trailing_expr) = block.expr;
+    if let ExprKind::Call(func1, args1) = trailing_expr.kind;
+    if let ExprKind::Path(ref qpath1) = func1.kind;
+    if match_qpath(qpath1, &["drop"]);
+    if args1.len() == 1;
+    if let ExprKind::Path(ref qpath2) = args1[0].kind;
+    if match_qpath(qpath2, &["expr"]);
+    then {
+        // report your lint here
+    }
+}
+if_chain! {
+    if let ExprKind::Closure(CaptureBy::Value, fn_decl, body_id, _, None) = expr.kind;
+    if let FnRetTy::DefaultReturn(_) = fn_decl.output;
+    let expr1 = &cx.tcx.hir().body(body_id).value;
+    if let ExprKind::Call(func, args) = expr1.kind;
+    if let ExprKind::Path(ref qpath) = func.kind;
+    if matches!(qpath, QPath::LangItem(LangItem::FromGenerator, _));
+    if args.len() == 1;
+    if let ExprKind::Closure(CaptureBy::Value, fn_decl1, body_id1, _, Some(Movability::Static)) = args[0].kind;
+    if let FnRetTy::DefaultReturn(_) = fn_decl1.output;
+    let expr2 = &cx.tcx.hir().body(body_id1).value;
+    if let ExprKind::Block(block, None) = expr2.kind;
+    if block.stmts.is_empty();
+    if block.expr.is_none();
+    then {
+        // report your lint here
+    }
+}
diff --git a/src/tools/clippy/tests/ui/author/call.rs b/src/tools/clippy/tests/ui/author/call.rs
new file mode 100644
index 000000000..e99c3c41d
--- /dev/null
+++ b/src/tools/clippy/tests/ui/author/call.rs
@@ -0,0 +1,4 @@
+fn main() {
+    #[clippy::author]
+    let _ = ::std::cmp::min(3, 4);
+}
diff --git a/src/tools/clippy/tests/ui/author/call.stdout b/src/tools/clippy/tests/ui/author/call.stdout
new file mode 100644
index 000000000..266312d63
--- /dev/null
+++ b/src/tools/clippy/tests/ui/author/call.stdout
@@ -0,0 +1,16 @@
+if_chain! {
+    if let StmtKind::Local(local) = stmt.kind;
+    if let Some(init) = local.init;
+    if let ExprKind::Call(func, args) = init.kind;
+    if let ExprKind::Path(ref qpath) = func.kind;
+    if match_qpath(qpath, &["{{root}}", "std", "cmp", "min"]);
+    if args.len() == 2;
+    if let ExprKind::Lit(ref lit) = args[0].kind;
+    if let LitKind::Int(3, LitIntType::Unsuffixed) = lit.node;
+    if let ExprKind::Lit(ref lit1) = args[1].kind;
+    if let LitKind::Int(4, LitIntType::Unsuffixed) = lit1.node;
+    if let PatKind::Wild = local.pat.kind;
+    then {
+        // report your lint here
+    }
+}
diff --git a/src/tools/clippy/tests/ui/author/if.rs b/src/tools/clippy/tests/ui/author/if.rs
new file mode 100644
index 000000000..946088ab3
--- /dev/null
+++ b/src/tools/clippy/tests/ui/author/if.rs
@@ -0,0 +1,17 @@
+#[allow(clippy::all)]
+
+fn main() {
+    #[clippy::author]
+    let _ = if true {
+        1 == 1;
+    } else {
+        2 == 2;
+    };
+
+    let a = true;
+
+    #[clippy::author]
+    if let true = a {
+    } else {
+    };
+}
diff --git a/src/tools/clippy/tests/ui/author/if.stdout b/src/tools/clippy/tests/ui/author/if.stdout
new file mode 100644
index 000000000..8d92849b3
--- /dev/null
+++ b/src/tools/clippy/tests/ui/author/if.stdout
@@ -0,0 +1,50 @@
+if_chain! {
+    if let StmtKind::Local(local) = stmt.kind;
+    if let Some(init) = local.init;
+    if let ExprKind::If(cond, then, Some(else_expr)) = init.kind;
+    if let ExprKind::DropTemps(expr) = cond.kind;
+    if let ExprKind::Lit(ref lit) = expr.kind;
+    if let LitKind::Bool(true) = lit.node;
+    if let ExprKind::Block(block, None) = then.kind;
+    if block.stmts.len() == 1;
+    if let StmtKind::Semi(e) = block.stmts[0].kind;
+    if let ExprKind::Binary(op, left, right) = e.kind;
+    if BinOpKind::Eq == op.node;
+    if let ExprKind::Lit(ref lit1) = left.kind;
+    if let LitKind::Int(1, LitIntType::Unsuffixed) = lit1.node;
+    if let ExprKind::Lit(ref lit2) = right.kind;
+    if let LitKind::Int(1, LitIntType::Unsuffixed) = lit2.node;
+    if block.expr.is_none();
+    if let ExprKind::Block(block1, None) = else_expr.kind;
+    if block1.stmts.len() == 1;
+    if let StmtKind::Semi(e1) = block1.stmts[0].kind;
+    if let ExprKind::Binary(op1, left1, right1) = e1.kind;
+    if BinOpKind::Eq == op1.node;
+    if let ExprKind::Lit(ref lit3) = left1.kind;
+    if let LitKind::Int(2, LitIntType::Unsuffixed) = lit3.node;
+    if let ExprKind::Lit(ref lit4) = right1.kind;
+    if let LitKind::Int(2, LitIntType::Unsuffixed) = lit4.node;
+    if block1.expr.is_none();
+    if let PatKind::Wild = local.pat.kind;
+    then {
+        // report your lint here
+    }
+}
+if_chain! {
+    if let ExprKind::If(cond, then, Some(else_expr)) = expr.kind;
+    if let ExprKind::Let(let_expr) = cond.kind;
+    if let PatKind::Lit(lit_expr) = let_expr.pat.kind;
+    if let ExprKind::Lit(ref lit) = lit_expr.kind;
+    if let LitKind::Bool(true) = lit.node;
+    if let ExprKind::Path(ref qpath) = let_expr.init.kind;
+    if match_qpath(qpath, &["a"]);
+    if let ExprKind::Block(block, None) = then.kind;
+    if block.stmts.is_empty();
+    if block.expr.is_none();
+    if let ExprKind::Block(block1, None) = else_expr.kind;
+    if block1.stmts.is_empty();
+    if block1.expr.is_none();
+    then {
+        // report your lint here
+    }
+}
diff --git a/src/tools/clippy/tests/ui/author/issue_3849.rs b/src/tools/clippy/tests/ui/author/issue_3849.rs
new file mode 100644
index 000000000..bae4570e5
--- /dev/null
+++ b/src/tools/clippy/tests/ui/author/issue_3849.rs
@@ -0,0 +1,14 @@
+#![allow(dead_code)]
+#![allow(clippy::zero_ptr)]
+#![allow(clippy::transmute_ptr_to_ref)]
+#![allow(clippy::transmuting_null)]
+
+pub const ZPTR: *const usize = 0 as *const _;
+
+fn main() {
+    unsafe {
+        #[clippy::author]
+        let _: &i32 = std::mem::transmute(ZPTR);
+        let _: &i32 = std::mem::transmute(0 as *const i32);
+    }
+}
diff --git a/src/tools/clippy/tests/ui/author/issue_3849.stdout b/src/tools/clippy/tests/ui/author/issue_3849.stdout
new file mode 100644
index 000000000..bce4bc702
--- /dev/null
+++ b/src/tools/clippy/tests/ui/author/issue_3849.stdout
@@ -0,0 +1,14 @@
+if_chain! {
+    if let StmtKind::Local(local) = stmt.kind;
+    if let Some(init) = local.init;
+    if let ExprKind::Call(func, args) = init.kind;
+    if let ExprKind::Path(ref qpath) = func.kind;
+    if match_qpath(qpath, &["std", "mem", "transmute"]);
+    if args.len() == 1;
+    if let ExprKind::Path(ref qpath1) = args[0].kind;
+    if match_qpath(qpath1, &["ZPTR"]);
+    if let PatKind::Wild = local.pat.kind;
+    then {
+        // report your lint here
+    }
+}
diff --git a/src/tools/clippy/tests/ui/author/loop.rs b/src/tools/clippy/tests/ui/author/loop.rs
new file mode 100644
index 000000000..d6de21631
--- /dev/null
+++ b/src/tools/clippy/tests/ui/author/loop.rs
@@ -0,0 +1,36 @@
+#![feature(stmt_expr_attributes)]
+#![allow(clippy::never_loop, clippy::while_immutable_condition)]
+
+fn main() {
+    #[clippy::author]
+    for y in 0..10 {
+        let z = y;
+    }
+
+    #[clippy::author]
+    for _ in 0..10 {
+        break;
+    }
+
+    #[clippy::author]
+    'label: for _ in 0..10 {
+        break 'label;
+    }
+
+    let a = true;
+
+    #[clippy::author]
+    while a {
+        break;
+    }
+
+    #[clippy::author]
+    while let true = a {
+        break;
+    }
+
+    #[clippy::author]
+    loop {
+        break;
+    }
+}
diff --git a/src/tools/clippy/tests/ui/author/loop.stdout b/src/tools/clippy/tests/ui/author/loop.stdout
new file mode 100644
index 000000000..3d9560f69
--- /dev/null
+++ b/src/tools/clippy/tests/ui/author/loop.stdout
@@ -0,0 +1,113 @@
+if_chain! {
+    if let Some(higher::ForLoop { pat: pat, arg: arg, body: body, .. }) = higher::ForLoop::hir(expr);
+    if let PatKind::Binding(BindingAnnotation::Unannotated, _, name, None) = pat.kind;
+    if name.as_str() == "y";
+    if let ExprKind::Struct(qpath, fields, None) = arg.kind;
+    if matches!(qpath, QPath::LangItem(LangItem::Range, _));
+    if fields.len() == 2;
+    if fields[0].ident.as_str() == "start";
+    if let ExprKind::Lit(ref lit) = fields[0].expr.kind;
+    if let LitKind::Int(0, LitIntType::Unsuffixed) = lit.node;
+    if fields[1].ident.as_str() == "end";
+    if let ExprKind::Lit(ref lit1) = fields[1].expr.kind;
+    if let LitKind::Int(10, LitIntType::Unsuffixed) = lit1.node;
+    if let ExprKind::Block(block, None) = body.kind;
+    if block.stmts.len() == 1;
+    if let StmtKind::Local(local) = block.stmts[0].kind;
+    if let Some(init) = local.init;
+    if let ExprKind::Path(ref qpath1) = init.kind;
+    if match_qpath(qpath1, &["y"]);
+    if let PatKind::Binding(BindingAnnotation::Unannotated, _, name1, None) = local.pat.kind;
+    if name1.as_str() == "z";
+    if block.expr.is_none();
+    then {
+        // report your lint here
+    }
+}
+if_chain! {
+    if let Some(higher::ForLoop { pat: pat, arg: arg, body: body, .. }) = higher::ForLoop::hir(expr);
+    if let PatKind::Wild = pat.kind;
+    if let ExprKind::Struct(qpath, fields, None) = arg.kind;
+    if matches!(qpath, QPath::LangItem(LangItem::Range, _));
+    if fields.len() == 2;
+    if fields[0].ident.as_str() == "start";
+    if let ExprKind::Lit(ref lit) = fields[0].expr.kind;
+    if let LitKind::Int(0, LitIntType::Unsuffixed) = lit.node;
+    if fields[1].ident.as_str() == "end";
+    if let ExprKind::Lit(ref lit1) = fields[1].expr.kind;
+    if let LitKind::Int(10, LitIntType::Unsuffixed) = lit1.node;
+    if let ExprKind::Block(block, None) = body.kind;
+    if block.stmts.len() == 1;
+    if let StmtKind::Semi(e) = block.stmts[0].kind;
+    if let ExprKind::Break(destination, None) = e.kind;
+    if destination.label.is_none();
+    if block.expr.is_none();
+    then {
+        // report your lint here
+    }
+}
+if_chain! {
+    if let Some(higher::ForLoop { pat: pat, arg: arg, body: body, .. }) = higher::ForLoop::hir(expr);
+    if let PatKind::Wild = pat.kind;
+    if let ExprKind::Struct(qpath, fields, None) = arg.kind;
+    if matches!(qpath, QPath::LangItem(LangItem::Range, _));
+    if fields.len() == 2;
+    if fields[0].ident.as_str() == "start";
+    if let ExprKind::Lit(ref lit) = fields[0].expr.kind;
+    if let LitKind::Int(0, LitIntType::Unsuffixed) = lit.node;
+    if fields[1].ident.as_str() == "end";
+    if let ExprKind::Lit(ref lit1) = fields[1].expr.kind;
+    if let LitKind::Int(10, LitIntType::Unsuffixed) = lit1.node;
+    if let ExprKind::Block(block, None) = body.kind;
+    if block.stmts.len() == 1;
+    if let StmtKind::Semi(e) = block.stmts[0].kind;
+    if let ExprKind::Break(destination, None) = e.kind;
+    if let Some(label) = destination.label;
+    if label.ident.as_str() == "'label";
+    if block.expr.is_none();
+    then {
+        // report your lint here
+    }
+}
+if_chain! {
+    if let Some(higher::While { condition: condition, body: body }) = higher::While::hir(expr);
+    if let ExprKind::Path(ref qpath) = condition.kind;
+    if match_qpath(qpath, &["a"]);
+    if let ExprKind::Block(block, None) = body.kind;
+    if block.stmts.len() == 1;
+    if let StmtKind::Semi(e) = block.stmts[0].kind;
+    if let ExprKind::Break(destination, None) = e.kind;
+    if destination.label.is_none();
+    if block.expr.is_none();
+    then {
+        // report your lint here
+    }
+}
+if_chain! {
+    if let Some(higher::WhileLet { let_pat: let_pat, let_expr: let_expr, if_then: if_then }) = higher::WhileLet::hir(expr);
+    if let PatKind::Lit(lit_expr) = let_pat.kind;
+    if let ExprKind::Lit(ref lit) = lit_expr.kind;
+    if let LitKind::Bool(true) = lit.node;
+    if let ExprKind::Path(ref qpath) = let_expr.kind;
+    if match_qpath(qpath, &["a"]);
+    if let ExprKind::Block(block, None) = if_then.kind;
+    if block.stmts.len() == 1;
+    if let StmtKind::Semi(e) = block.stmts[0].kind;
+    if let ExprKind::Break(destination, None) = e.kind;
+    if destination.label.is_none();
+    if block.expr.is_none();
+    then {
+        // report your lint here
+    }
+}
+if_chain! {
+    if let ExprKind::Loop(body, None, LoopSource::Loop, _) = expr.kind;
+    if body.stmts.len() == 1;
+    if let StmtKind::Semi(e) = body.stmts[0].kind;
+    if let ExprKind::Break(destination, None) = e.kind;
+    if destination.label.is_none();
+    if body.expr.is_none();
+    then {
+        // report your lint here
+    }
+}
diff --git a/src/tools/clippy/tests/ui/author/matches.rs b/src/tools/clippy/tests/ui/author/matches.rs
new file mode 100644
index 000000000..674e07ec2
--- /dev/null
+++ b/src/tools/clippy/tests/ui/author/matches.rs
@@ -0,0 +1,13 @@
+#![allow(clippy::let_and_return)]
+
+fn main() {
+    #[clippy::author]
+    let a = match 42 {
+        16 => 5,
+        17 => {
+            let x = 3;
+            x
+        },
+        _ => 1,
+    };
+}
diff --git a/src/tools/clippy/tests/ui/author/matches.stdout b/src/tools/clippy/tests/ui/author/matches.stdout
new file mode 100644
index 000000000..38444a009
--- /dev/null
+++ b/src/tools/clippy/tests/ui/author/matches.stdout
@@ -0,0 +1,38 @@
+if_chain! {
+    if let StmtKind::Local(local) = stmt.kind;
+    if let Some(init) = local.init;
+    if let ExprKind::Match(scrutinee, arms, MatchSource::Normal) = init.kind;
+    if let ExprKind::Lit(ref lit) = scrutinee.kind;
+    if let LitKind::Int(42, LitIntType::Unsuffixed) = lit.node;
+    if arms.len() == 3;
+    if let PatKind::Lit(lit_expr) = arms[0].pat.kind;
+    if let ExprKind::Lit(ref lit1) = lit_expr.kind;
+    if let LitKind::Int(16, LitIntType::Unsuffixed) = lit1.node;
+    if arms[0].guard.is_none();
+    if let ExprKind::Lit(ref lit2) = arms[0].body.kind;
+    if let LitKind::Int(5, LitIntType::Unsuffixed) = lit2.node;
+    if let PatKind::Lit(lit_expr1) = arms[1].pat.kind;
+    if let ExprKind::Lit(ref lit3) = lit_expr1.kind;
+    if let LitKind::Int(17, LitIntType::Unsuffixed) = lit3.node;
+    if arms[1].guard.is_none();
+    if let ExprKind::Block(block, None) = arms[1].body.kind;
+    if block.stmts.len() == 1;
+    if let StmtKind::Local(local1) = block.stmts[0].kind;
+    if let Some(init1) = local1.init;
+    if let ExprKind::Lit(ref lit4) = init1.kind;
+    if let LitKind::Int(3, LitIntType::Unsuffixed) = lit4.node;
+    if let PatKind::Binding(BindingAnnotation::Unannotated, _, name, None) = local1.pat.kind;
+    if name.as_str() == "x";
+    if let Some(trailing_expr) = block.expr;
+    if let ExprKind::Path(ref qpath) = trailing_expr.kind;
+    if match_qpath(qpath, &["x"]);
+    if let PatKind::Wild = arms[2].pat.kind;
+    if arms[2].guard.is_none();
+    if let ExprKind::Lit(ref lit5) = arms[2].body.kind;
+    if let LitKind::Int(1, LitIntType::Unsuffixed) = lit5.node;
+    if let PatKind::Binding(BindingAnnotation::Unannotated, _, name1, None) = local.pat.kind;
+    if name1.as_str() == "a";
+    then {
+        // report your lint here
+    }
+}
diff --git a/src/tools/clippy/tests/ui/author/repeat.rs b/src/tools/clippy/tests/ui/author/repeat.rs
new file mode 100644
index 000000000..d8e9d589e
--- /dev/null
+++ b/src/tools/clippy/tests/ui/author/repeat.rs
@@ -0,0 +1,5 @@
+#[allow(clippy::no_effect)]
+fn main() {
+    #[clippy::author]
+    [1_u8; 5];
+}
diff --git a/src/tools/clippy/tests/ui/author/repeat.stdout b/src/tools/clippy/tests/ui/author/repeat.stdout
new file mode 100644
index 000000000..471bbce4f
--- /dev/null
+++ b/src/tools/clippy/tests/ui/author/repeat.stdout
@@ -0,0 +1,12 @@
+if_chain! {
+    if let ExprKind::Repeat(value, length) = expr.kind;
+    if let ExprKind::Lit(ref lit) = value.kind;
+    if let LitKind::Int(1, LitIntType::Unsigned(UintTy::U8)) = lit.node;
+    if let ArrayLen::Body(anon_const) = length;
+    let expr1 = &cx.tcx.hir().body(anon_const.body).value;
+    if let ExprKind::Lit(ref lit1) = expr1.kind;
+    if let LitKind::Int(5, LitIntType::Unsuffixed) = lit1.node;
+    then {
+        // report your lint here
+    }
+}
diff --git a/src/tools/clippy/tests/ui/author/struct.rs b/src/tools/clippy/tests/ui/author/struct.rs
new file mode 100644
index 000000000..5fdf3433a
--- /dev/null
+++ b/src/tools/clippy/tests/ui/author/struct.rs
@@ -0,0 +1,40 @@
+#[allow(clippy::unnecessary_operation, clippy::single_match)]
+fn main() {
+    struct Test {
+        field: u32,
+    }
+
+    #[clippy::author]
+    Test {
+        field: if true { 1 } else { 0 },
+    };
+
+    let test = Test { field: 1 };
+
+    match test {
+        #[clippy::author]
+        Test { field: 1 } => {},
+        _ => {},
+    }
+
+    struct TestTuple(u32);
+
+    let test_tuple = TestTuple(1);
+
+    match test_tuple {
+        #[clippy::author]
+        TestTuple(1) => {},
+        _ => {},
+    }
+
+    struct TestMethodCall(u32);
+
+    impl TestMethodCall {
+        fn test(&self) {}
+    }
+
+    let test_method_call = TestMethodCall(1);
+
+    #[clippy::author]
+    test_method_call.test();
+}
diff --git a/src/tools/clippy/tests/ui/author/struct.stdout b/src/tools/clippy/tests/ui/author/struct.stdout
new file mode 100644
index 000000000..5e78b7c9d
--- /dev/null
+++ b/src/tools/clippy/tests/ui/author/struct.stdout
@@ -0,0 +1,64 @@
+if_chain! {
+    if let ExprKind::Struct(qpath, fields, None) = expr.kind;
+    if match_qpath(qpath, &["Test"]);
+    if fields.len() == 1;
+    if fields[0].ident.as_str() == "field";
+    if let ExprKind::If(cond, then, Some(else_expr)) = fields[0].expr.kind;
+    if let ExprKind::DropTemps(expr1) = cond.kind;
+    if let ExprKind::Lit(ref lit) = expr1.kind;
+    if let LitKind::Bool(true) = lit.node;
+    if let ExprKind::Block(block, None) = then.kind;
+    if block.stmts.is_empty();
+    if let Some(trailing_expr) = block.expr;
+    if let ExprKind::Lit(ref lit1) = trailing_expr.kind;
+    if let LitKind::Int(1, LitIntType::Unsuffixed) = lit1.node;
+    if let ExprKind::Block(block1, None) = else_expr.kind;
+    if block1.stmts.is_empty();
+    if let Some(trailing_expr1) = block1.expr;
+    if let ExprKind::Lit(ref lit2) = trailing_expr1.kind;
+    if let LitKind::Int(0, LitIntType::Unsuffixed) = lit2.node;
+    then {
+        // report your lint here
+    }
+}
+if_chain! {
+    if let PatKind::Struct(ref qpath, fields, false) = arm.pat.kind;
+    if match_qpath(qpath, &["Test"]);
+    if fields.len() == 1;
+    if fields[0].ident.as_str() == "field";
+    if let PatKind::Lit(lit_expr) = fields[0].pat.kind;
+    if let ExprKind::Lit(ref lit) = lit_expr.kind;
+    if let LitKind::Int(1, LitIntType::Unsuffixed) = lit.node;
+    if arm.guard.is_none();
+    if let ExprKind::Block(block, None) = arm.body.kind;
+    if block.stmts.is_empty();
+    if block.expr.is_none();
+    then {
+        // report your lint here
+    }
+}
+if_chain! {
+    if let PatKind::TupleStruct(ref qpath, fields, None) = arm.pat.kind;
+    if match_qpath(qpath, &["TestTuple"]);
+    if fields.len() == 1;
+    if let PatKind::Lit(lit_expr) = fields[0].kind;
+    if let ExprKind::Lit(ref lit) = lit_expr.kind;
+    if let LitKind::Int(1, LitIntType::Unsuffixed) = lit.node;
+    if arm.guard.is_none();
+    if let ExprKind::Block(block, None) = arm.body.kind;
+    if block.stmts.is_empty();
+    if block.expr.is_none();
+    then {
+        // report your lint here
+    }
+}
+if_chain! {
+    if let ExprKind::MethodCall(method_name, args, _) = expr.kind;
+    if method_name.ident.as_str() == "test";
+    if args.len() == 1;
+    if let ExprKind::Path(ref qpath) = args[0].kind;
+    if match_qpath(qpath, &["test_method_call"]);
+    then {
+        // report your lint here
+    }
+}