lint nested `dbg!` macros, split tests

9 files changed, 269 insertions, 103 deletions

diff --git a/clippy_lints/src/dbg_macro.rs b/clippy_lints/src/dbg_macro.rs
index a517d7bd661..bd61260d94e 100644
--- a/clippy_lints/src/dbg_macro.rs
+++ b/clippy_lints/src/dbg_macro.rs
@@ -2,6 +2,7 @@ use clippy_utils::diagnostics::span_lint_and_sugg;
 use clippy_utils::macros::root_macro_call;
 use clippy_utils::source::snippet_with_applicability;
 use clippy_utils::{is_in_cfg_test, is_in_test_function};
+use rustc_data_structures::fx::FxHashSet;
 use rustc_errors::Applicability;
 use rustc_hir::{Expr, ExprKind, Node};
 use rustc_lint::{LateContext, LateLintPass, LintContext};
@@ -31,12 +32,12 @@ declare_clippy_lint! {
     "`dbg!` macro is intended as a debugging tool"
 }
 
-#[derive(Copy, Clone)]
+#[derive(Clone)]
 pub struct DbgMacro {
     allow_dbg_in_tests: bool,
-    /// Keep tracking of the previous `dbg!` macro call site in order to
-    /// skip any other expressions from the same expansion, including nested macro calls.
-    prev_dbg_call_site: Span,
+    /// Keep tracks the `dbg!` macro callsites that are already checked,
+    /// so that we can save some performance by skipping any expressions from the same expansion.
+    checked_dbg_call_site: FxHashSet<Span>,
 }
 
 impl_lint_pass!(DbgMacro => [DBG_MACRO]);
@@ -45,7 +46,7 @@ impl DbgMacro {
     pub fn new(allow_dbg_in_tests: bool) -> Self {
         DbgMacro {
             allow_dbg_in_tests,
-            prev_dbg_call_site: Span::default(),
+            checked_dbg_call_site: FxHashSet::default(),
         }
     }
 }
@@ -57,11 +58,10 @@ impl LateLintPass<'_> for DbgMacro {
         else {
             return;
         };
-        // skip previous checked exprs
-        if self.prev_dbg_call_site.contains(macro_call.span) {
+        if self.checked_dbg_call_site.contains(&macro_call.span) {
             return;
         }
-        self.prev_dbg_call_site = macro_call.span;
+        self.checked_dbg_call_site.insert(macro_call.span);
 
         // allows `dbg!` in test code if allow-dbg-in-test is set to true in clippy.toml
         if self.allow_dbg_in_tests && (is_in_test_function(cx.tcx, expr.hir_id) || is_in_cfg_test(cx.tcx, expr.hir_id))
diff --git a/tests/ui-toml/dbg_macro/dbg_macro.fixed b/tests/ui-toml/dbg_macro/dbg_macro.fixed
new file mode 100644
index 00000000000..d42b29ba21a
--- /dev/null
+++ b/tests/ui-toml/dbg_macro/dbg_macro.fixed
@@ -0,0 +1,38 @@
+//@compile-flags: --test
+#![warn(clippy::dbg_macro)]
+#![allow(clippy::unnecessary_operation, clippy::no_effect)]
+
+fn foo(n: u32) -> u32 {
+    if let Some(n) = n.checked_sub(4) { n } else { n }
+}
+
+fn factorial(n: u32) -> u32 {
+    if n <= 1 {
+        1
+    } else {
+        n * factorial(n - 1)
+    }
+}
+
+fn main() {
+    42;
+    foo(3) + factorial(4);
+    (1, 2, 3, 4, 5);
+}
+
+#[test]
+pub fn issue8481() {
+    dbg!(1);
+}
+
+#[cfg(test)]
+fn foo2() {
+    dbg!(1);
+}
+
+#[cfg(test)]
+mod mod1 {
+    fn func() {
+        dbg!(1);
+    }
+}
diff --git a/tests/ui-toml/dbg_macro/dbg_macro.rs b/tests/ui-toml/dbg_macro/dbg_macro.rs
index 67129e62477..bd189b1576f 100644
--- a/tests/ui-toml/dbg_macro/dbg_macro.rs
+++ b/tests/ui-toml/dbg_macro/dbg_macro.rs
@@ -1,6 +1,7 @@
 //@compile-flags: --test
 #![warn(clippy::dbg_macro)]
-//@no-rustfix
+#![allow(clippy::unnecessary_operation, clippy::no_effect)]
+
 fn foo(n: u32) -> u32 {
     if let Some(n) = dbg!(n.checked_sub(4)) { n } else { n }
 }
@@ -15,9 +16,7 @@ fn factorial(n: u32) -> u32 {
 
 fn main() {
     dbg!(42);
-    dbg!(dbg!(dbg!(42)));
     foo(3) + dbg!(factorial(4));
-    dbg!(1, 2, dbg!(3, 4));
     dbg!(1, 2, 3, 4, 5);
 }
 
diff --git a/tests/ui-toml/dbg_macro/dbg_macro.stderr b/tests/ui-toml/dbg_macro/dbg_macro.stderr
index 8ffc426be2d..129fab5ff97 100644
--- a/tests/ui-toml/dbg_macro/dbg_macro.stderr
+++ b/tests/ui-toml/dbg_macro/dbg_macro.stderr
@@ -1,5 +1,5 @@
 error: the `dbg!` macro is intended as a debugging tool
-  --> tests/ui-toml/dbg_macro/dbg_macro.rs:5:22
+  --> tests/ui-toml/dbg_macro/dbg_macro.rs:6:22
    |
 LL |     if let Some(n) = dbg!(n.checked_sub(4)) { n } else { n }
    |                      ^^^^^^^^^^^^^^^^^^^^^^
@@ -12,7 +12,7 @@ LL |     if let Some(n) = n.checked_sub(4) { n } else { n }
    |                      ~~~~~~~~~~~~~~~~
 
 error: the `dbg!` macro is intended as a debugging tool
-  --> tests/ui-toml/dbg_macro/dbg_macro.rs:9:8
+  --> tests/ui-toml/dbg_macro/dbg_macro.rs:10:8
    |
 LL |     if dbg!(n <= 1) {
    |        ^^^^^^^^^^^^
@@ -23,7 +23,7 @@ LL |     if n <= 1 {
    |        ~~~~~~
 
 error: the `dbg!` macro is intended as a debugging tool
-  --> tests/ui-toml/dbg_macro/dbg_macro.rs:10:9
+  --> tests/ui-toml/dbg_macro/dbg_macro.rs:11:9
    |
 LL |         dbg!(1)
    |         ^^^^^^^
@@ -34,7 +34,7 @@ LL |         1
    |
 
 error: the `dbg!` macro is intended as a debugging tool
-  --> tests/ui-toml/dbg_macro/dbg_macro.rs:12:9
+  --> tests/ui-toml/dbg_macro/dbg_macro.rs:13:9
    |
 LL |         dbg!(n * factorial(n - 1))
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -45,7 +45,7 @@ LL |         n * factorial(n - 1)
    |
 
 error: the `dbg!` macro is intended as a debugging tool
-  --> tests/ui-toml/dbg_macro/dbg_macro.rs:17:5
+  --> tests/ui-toml/dbg_macro/dbg_macro.rs:18:5
    |
 LL |     dbg!(42);
    |     ^^^^^^^^
@@ -56,17 +56,6 @@ LL |     42;
    |     ~~
 
 error: the `dbg!` macro is intended as a debugging tool
-  --> tests/ui-toml/dbg_macro/dbg_macro.rs:18:5
-   |
-LL |     dbg!(dbg!(dbg!(42)));
-   |     ^^^^^^^^^^^^^^^^^^^^
-   |
-help: remove the invocation before committing it to a version control system
-   |
-LL |     dbg!(dbg!(42));
-   |     ~~~~~~~~~~~~~~
-
-error: the `dbg!` macro is intended as a debugging tool
   --> tests/ui-toml/dbg_macro/dbg_macro.rs:19:14
    |
 LL |     foo(3) + dbg!(factorial(4));
@@ -80,17 +69,6 @@ LL |     foo(3) + factorial(4);
 error: the `dbg!` macro is intended as a debugging tool
   --> tests/ui-toml/dbg_macro/dbg_macro.rs:20:5
    |
-LL |     dbg!(1, 2, dbg!(3, 4));
-   |     ^^^^^^^^^^^^^^^^^^^^^^
-   |
-help: remove the invocation before committing it to a version control system
-   |
-LL |     (1, 2, dbg!(3, 4));
-   |     ~~~~~~~~~~~~~~~~~~
-
-error: the `dbg!` macro is intended as a debugging tool
-  --> tests/ui-toml/dbg_macro/dbg_macro.rs:21:5
-   |
 LL |     dbg!(1, 2, 3, 4, 5);
    |     ^^^^^^^^^^^^^^^^^^^
    |
@@ -99,5 +77,5 @@ help: remove the invocation before committing it to a version control system
 LL |     (1, 2, 3, 4, 5);
    |     ~~~~~~~~~~~~~~~
 
-error: aborting due to 9 previous errors
+error: aborting due to 7 previous errors
 
diff --git a/tests/ui/dbg_macro/dbg_macro.fixed b/tests/ui/dbg_macro/dbg_macro.fixed
new file mode 100644
index 00000000000..7197c3c8f47
--- /dev/null
+++ b/tests/ui/dbg_macro/dbg_macro.fixed
@@ -0,0 +1,110 @@
+#![warn(clippy::dbg_macro)]
+#![allow(clippy::unnecessary_operation, clippy::no_effect)]
+
+fn foo(n: u32) -> u32 {
+    if let Some(n) = n.checked_sub(4) { n } else { n }
+    //~^ ERROR: the `dbg!` macro is intended as a debugging tool
+}
+fn bar(_: ()) {}
+
+fn factorial(n: u32) -> u32 {
+    if n <= 1 {
+        //~^ ERROR: the `dbg!` macro is intended as a debugging tool
+        1
+        //~^ ERROR: the `dbg!` macro is intended as a debugging tool
+    } else {
+        n * factorial(n - 1)
+        //~^ ERROR: the `dbg!` macro is intended as a debugging tool
+    }
+}
+
+fn main() {
+    42;
+    //~^ ERROR: the `dbg!` macro is intended as a debugging tool
+    foo(3) + factorial(4);
+    //~^ ERROR: the `dbg!` macro is intended as a debugging tool
+    (1, 2, 3, 4, 5);
+    //~^ ERROR: the `dbg!` macro is intended as a debugging tool
+}
+
+fn issue9914() {
+    macro_rules! foo {
+        ($x:expr) => {
+            $x;
+        };
+    }
+    macro_rules! foo2 {
+        ($x:expr) => {
+            $x;
+        };
+    }
+    macro_rules! expand_to_dbg {
+        () => {
+            dbg!();
+        };
+    }
+
+    
+    //~^ ERROR: the `dbg!` macro is intended as a debugging tool
+    #[allow(clippy::let_unit_value)]
+    let _ = ();
+    //~^ ERROR: the `dbg!` macro is intended as a debugging tool
+    bar(());
+    //~^ ERROR: the `dbg!` macro is intended as a debugging tool
+    foo!(());
+    //~^ ERROR: the `dbg!` macro is intended as a debugging tool
+    foo2!(foo!(()));
+    //~^ ERROR: the `dbg!` macro is intended as a debugging tool
+    expand_to_dbg!();
+}
+
+mod issue7274 {
+    trait Thing<'b> {
+        fn foo(&self);
+    }
+
+    macro_rules! define_thing {
+        ($thing:ident, $body:expr) => {
+            impl<'a> Thing<'a> for $thing {
+                fn foo<'b>(&self) {
+                    $body
+                }
+            }
+        };
+    }
+
+    struct MyThing;
+    define_thing!(MyThing, {
+        2;
+        //~^ ERROR: the `dbg!` macro is intended as a debugging tool
+    });
+}
+
+#[test]
+pub fn issue8481() {
+    1;
+    //~^ ERROR: the `dbg!` macro is intended as a debugging tool
+}
+
+#[cfg(test)]
+fn foo2() {
+    1;
+    //~^ ERROR: the `dbg!` macro is intended as a debugging tool
+}
+
+#[cfg(test)]
+mod mod1 {
+    fn func() {
+        1;
+        //~^ ERROR: the `dbg!` macro is intended as a debugging tool
+    }
+}
+
+mod issue12131 {
+    fn dbg_in_print(s: &str) {
+        println!("dbg: {:?}", s);
+        //~^ ERROR: the `dbg!` macro is intended as a debugging tool
+        print!("{}", s);
+        //~^ ERROR: the `dbg!` macro is intended as a debugging tool
+    }
+}
diff --git a/tests/ui/dbg_macro/dbg_macro.rs b/tests/ui/dbg_macro/dbg_macro.rs
index bdb6c379f88..0815d9f38dc 100644
--- a/tests/ui/dbg_macro/dbg_macro.rs
+++ b/tests/ui/dbg_macro/dbg_macro.rs
@@ -1,9 +1,5 @@
-//@no-rustfix
-
 #![warn(clippy::dbg_macro)]
-
-#[path = "auxiliary/submodule.rs"]
-mod submodule;
+#![allow(clippy::unnecessary_operation, clippy::no_effect)]
 
 fn foo(n: u32) -> u32 {
     if let Some(n) = dbg!(n.checked_sub(4)) { n } else { n }
@@ -25,12 +21,8 @@ fn factorial(n: u32) -> u32 {
 fn main() {
     dbg!(42);
     //~^ ERROR: the `dbg!` macro is intended as a debugging tool
-    dbg!(dbg!(dbg!(42)));
-    //~^ ERROR: the `dbg!` macro is intended as a debugging tool
     foo(3) + dbg!(factorial(4));
     //~^ ERROR: the `dbg!` macro is intended as a debugging tool
-    dbg!(1, 2, dbg!(3, 4));
-    //~^ ERROR: the `dbg!` macro is intended as a debugging tool
     dbg!(1, 2, 3, 4, 5);
     //~^ ERROR: the `dbg!` macro is intended as a debugging tool
 }
diff --git a/tests/ui/dbg_macro/dbg_macro.stderr b/tests/ui/dbg_macro/dbg_macro.stderr
index f632497bd73..5ff49816d00 100644
--- a/tests/ui/dbg_macro/dbg_macro.stderr
+++ b/tests/ui/dbg_macro/dbg_macro.stderr
@@ -1,30 +1,18 @@
 error: the `dbg!` macro is intended as a debugging tool
-  --> tests/ui/dbg_macro/auxiliary/submodule.rs:2:5
-   |
-LL |     dbg!();
-   |     ^^^^^^^
-   |
-   = note: `-D clippy::dbg-macro` implied by `-D warnings`
-   = help: to override `-D warnings` add `#[allow(clippy::dbg_macro)]`
-help: remove the invocation before committing it to a version control system
-   |
-LL -     dbg!();
-LL +     
-   |
-
-error: the `dbg!` macro is intended as a debugging tool
-  --> tests/ui/dbg_macro/dbg_macro.rs:9:22
+  --> tests/ui/dbg_macro/dbg_macro.rs:5:22
    |
 LL |     if let Some(n) = dbg!(n.checked_sub(4)) { n } else { n }
    |                      ^^^^^^^^^^^^^^^^^^^^^^
    |
+   = note: `-D clippy::dbg-macro` implied by `-D warnings`
+   = help: to override `-D warnings` add `#[allow(clippy::dbg_macro)]`
 help: remove the invocation before committing it to a version control system
    |
 LL |     if let Some(n) = n.checked_sub(4) { n } else { n }
    |                      ~~~~~~~~~~~~~~~~
 
 error: the `dbg!` macro is intended as a debugging tool
-  --> tests/ui/dbg_macro/dbg_macro.rs:15:8
+  --> tests/ui/dbg_macro/dbg_macro.rs:11:8
    |
 LL |     if dbg!(n <= 1) {
    |        ^^^^^^^^^^^^
@@ -35,7 +23,7 @@ LL |     if n <= 1 {
    |        ~~~~~~
 
 error: the `dbg!` macro is intended as a debugging tool
-  --> tests/ui/dbg_macro/dbg_macro.rs:17:9
+  --> tests/ui/dbg_macro/dbg_macro.rs:13:9
    |
 LL |         dbg!(1)
    |         ^^^^^^^
@@ -46,7 +34,7 @@ LL |         1
    |
 
 error: the `dbg!` macro is intended as a debugging tool
-  --> tests/ui/dbg_macro/dbg_macro.rs:20:9
+  --> tests/ui/dbg_macro/dbg_macro.rs:16:9
    |
 LL |         dbg!(n * factorial(n - 1))
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -57,7 +45,7 @@ LL |         n * factorial(n - 1)
    |
 
 error: the `dbg!` macro is intended as a debugging tool
-  --> tests/ui/dbg_macro/dbg_macro.rs:26:5
+  --> tests/ui/dbg_macro/dbg_macro.rs:22:5
    |
 LL |     dbg!(42);
    |     ^^^^^^^^
@@ -68,18 +56,7 @@ LL |     42;
    |     ~~
 
 error: the `dbg!` macro is intended as a debugging tool
-  --> tests/ui/dbg_macro/dbg_macro.rs:28:5
-   |
-LL |     dbg!(dbg!(dbg!(42)));
-   |     ^^^^^^^^^^^^^^^^^^^^
-   |
-help: remove the invocation before committing it to a version control system
-   |
-LL |     dbg!(dbg!(42));
-   |     ~~~~~~~~~~~~~~
-
-error: the `dbg!` macro is intended as a debugging tool
-  --> tests/ui/dbg_macro/dbg_macro.rs:30:14
+  --> tests/ui/dbg_macro/dbg_macro.rs:24:14
    |
 LL |     foo(3) + dbg!(factorial(4));
    |              ^^^^^^^^^^^^^^^^^^
@@ -90,18 +67,7 @@ LL |     foo(3) + factorial(4);
    |              ~~~~~~~~~~~~
 
 error: the `dbg!` macro is intended as a debugging tool
-  --> tests/ui/dbg_macro/dbg_macro.rs:32:5
-   |
-LL |     dbg!(1, 2, dbg!(3, 4));
-   |     ^^^^^^^^^^^^^^^^^^^^^^
-   |
-help: remove the invocation before committing it to a version control system
-   |
-LL |     (1, 2, dbg!(3, 4));
-   |     ~~~~~~~~~~~~~~~~~~
-
-error: the `dbg!` macro is intended as a debugging tool
-  --> tests/ui/dbg_macro/dbg_macro.rs:34:5
+  --> tests/ui/dbg_macro/dbg_macro.rs:26:5
    |
 LL |     dbg!(1, 2, 3, 4, 5);
    |     ^^^^^^^^^^^^^^^^^^^
@@ -112,7 +78,7 @@ LL |     (1, 2, 3, 4, 5);
    |     ~~~~~~~~~~~~~~~
 
 error: the `dbg!` macro is intended as a debugging tool
-  --> tests/ui/dbg_macro/dbg_macro.rs:55:5
+  --> tests/ui/dbg_macro/dbg_macro.rs:47:5
    |
 LL |     dbg!();
    |     ^^^^^^^
@@ -124,7 +90,7 @@ LL +
    |
 
 error: the `dbg!` macro is intended as a debugging tool
-  --> tests/ui/dbg_macro/dbg_macro.rs:58:13
+  --> tests/ui/dbg_macro/dbg_macro.rs:50:13
    |
 LL |     let _ = dbg!();
    |             ^^^^^^
@@ -135,7 +101,7 @@ LL |     let _ = ();
    |             ~~
 
 error: the `dbg!` macro is intended as a debugging tool
-  --> tests/ui/dbg_macro/dbg_macro.rs:60:9
+  --> tests/ui/dbg_macro/dbg_macro.rs:52:9
    |
 LL |     bar(dbg!());
    |         ^^^^^^
@@ -146,7 +112,7 @@ LL |     bar(());
    |         ~~
 
 error: the `dbg!` macro is intended as a debugging tool
-  --> tests/ui/dbg_macro/dbg_macro.rs:62:10
+  --> tests/ui/dbg_macro/dbg_macro.rs:54:10
    |
 LL |     foo!(dbg!());
    |          ^^^^^^
@@ -157,7 +123,7 @@ LL |     foo!(());
    |          ~~
 
 error: the `dbg!` macro is intended as a debugging tool
-  --> tests/ui/dbg_macro/dbg_macro.rs:64:16
+  --> tests/ui/dbg_macro/dbg_macro.rs:56:16
    |
 LL |     foo2!(foo!(dbg!()));
    |                ^^^^^^
@@ -168,7 +134,7 @@ LL |     foo2!(foo!(()));
    |                ~~
 
 error: the `dbg!` macro is intended as a debugging tool
-  --> tests/ui/dbg_macro/dbg_macro.rs:86:9
+  --> tests/ui/dbg_macro/dbg_macro.rs:78:9
    |
 LL |         dbg!(2);
    |         ^^^^^^^
@@ -179,7 +145,7 @@ LL |         2;
    |         ~
 
 error: the `dbg!` macro is intended as a debugging tool
-  --> tests/ui/dbg_macro/dbg_macro.rs:93:5
+  --> tests/ui/dbg_macro/dbg_macro.rs:85:5
    |
 LL |     dbg!(1);
    |     ^^^^^^^
@@ -190,7 +156,7 @@ LL |     1;
    |     ~
 
 error: the `dbg!` macro is intended as a debugging tool
-  --> tests/ui/dbg_macro/dbg_macro.rs:99:5
+  --> tests/ui/dbg_macro/dbg_macro.rs:91:5
    |
 LL |     dbg!(1);
    |     ^^^^^^^
@@ -201,7 +167,7 @@ LL |     1;
    |     ~
 
 error: the `dbg!` macro is intended as a debugging tool
-  --> tests/ui/dbg_macro/dbg_macro.rs:106:9
+  --> tests/ui/dbg_macro/dbg_macro.rs:98:9
    |
 LL |         dbg!(1);
    |         ^^^^^^^
@@ -212,7 +178,7 @@ LL |         1;
    |         ~
 
 error: the `dbg!` macro is intended as a debugging tool
-  --> $DIR/dbg_macro.rs:113:31
+  --> tests/ui/dbg_macro/dbg_macro.rs:105:31
    |
 LL |         println!("dbg: {:?}", dbg!(s));
    |                               ^^^^^^^
@@ -223,7 +189,7 @@ LL |         println!("dbg: {:?}", s);
    |                               ~
 
 error: the `dbg!` macro is intended as a debugging tool
-  --> $DIR/dbg_macro.rs:115:22
+  --> tests/ui/dbg_macro/dbg_macro.rs:107:22
    |
 LL |         print!("{}", dbg!(s));
    |                      ^^^^^^^
@@ -233,5 +199,5 @@ help: remove the invocation before committing it to a version control system
 LL |         print!("{}", s);
    |                      ~
 
-error: aborting due to 21 previous errors
+error: aborting due to 18 previous errors
 
diff --git a/tests/ui/dbg_macro/dbg_macro_unfixable.rs b/tests/ui/dbg_macro/dbg_macro_unfixable.rs
new file mode 100644
index 00000000000..0e83766ccae
--- /dev/null
+++ b/tests/ui/dbg_macro/dbg_macro_unfixable.rs
@@ -0,0 +1,12 @@
+//@no-rustfix
+#![warn(clippy::dbg_macro)]
+
+#[path = "auxiliary/submodule.rs"]
+mod submodule;
+
+fn main() {
+    dbg!(dbg!(dbg!(42)));
+    //~^ ERROR: the `dbg!` macro is intended as a debugging tool
+    dbg!(1, 2, dbg!(3, 4));
+    //~^ ERROR: the `dbg!` macro is intended as a debugging tool
+}
diff --git a/tests/ui/dbg_macro/dbg_macro_unfixable.stderr b/tests/ui/dbg_macro/dbg_macro_unfixable.stderr
new file mode 100644
index 00000000000..d21595c2fcd
--- /dev/null
+++ b/tests/ui/dbg_macro/dbg_macro_unfixable.stderr
@@ -0,0 +1,71 @@
+error: the `dbg!` macro is intended as a debugging tool
+  --> tests/ui/dbg_macro/auxiliary/submodule.rs:2:5
+   |
+LL |     dbg!();
+   |     ^^^^^^^
+   |
+   = note: `-D clippy::dbg-macro` implied by `-D warnings`
+   = help: to override `-D warnings` add `#[allow(clippy::dbg_macro)]`
+help: remove the invocation before committing it to a version control system
+   |
+LL -     dbg!();
+LL +     
+   |
+
+error: the `dbg!` macro is intended as a debugging tool
+  --> tests/ui/dbg_macro/dbg_macro_unfixable.rs:8:5
+   |
+LL |     dbg!(dbg!(dbg!(42)));
+   |     ^^^^^^^^^^^^^^^^^^^^
+   |
+help: remove the invocation before committing it to a version control system
+   |
+LL |     dbg!(dbg!(42));
+   |     ~~~~~~~~~~~~~~
+
+error: the `dbg!` macro is intended as a debugging tool
+  --> tests/ui/dbg_macro/dbg_macro_unfixable.rs:8:10
+   |
+LL |     dbg!(dbg!(dbg!(42)));
+   |          ^^^^^^^^^^^^^^
+   |
+help: remove the invocation before committing it to a version control system
+   |
+LL |     dbg!(dbg!(42));
+   |          ~~~~~~~~
+
+error: the `dbg!` macro is intended as a debugging tool
+  --> tests/ui/dbg_macro/dbg_macro_unfixable.rs:8:15
+   |
+LL |     dbg!(dbg!(dbg!(42)));
+   |               ^^^^^^^^
+   |
+help: remove the invocation before committing it to a version control system
+   |
+LL |     dbg!(dbg!(42));
+   |               ~~
+
+error: the `dbg!` macro is intended as a debugging tool
+  --> tests/ui/dbg_macro/dbg_macro_unfixable.rs:10:5
+   |
+LL |     dbg!(1, 2, dbg!(3, 4));
+   |     ^^^^^^^^^^^^^^^^^^^^^^
+   |
+help: remove the invocation before committing it to a version control system
+   |
+LL |     (1, 2, dbg!(3, 4));
+   |     ~~~~~~~~~~~~~~~~~~
+
+error: the `dbg!` macro is intended as a debugging tool
+  --> tests/ui/dbg_macro/dbg_macro_unfixable.rs:10:16
+   |
+LL |     dbg!(1, 2, dbg!(3, 4));
+   |                ^^^^^^^^^^
+   |
+help: remove the invocation before committing it to a version control system
+   |
+LL |     dbg!(1, 2, (3, 4));
+   |                ~~~~~~
+
+error: aborting due to 6 previous errors
+