works (tests + description TODO)

also removed RAII guard because it didn't work for some reason

Author: Centri3

clippy_lints/src/excessive_nesting.rs

@@ -1,5 +1,5 @@
 #![allow(unused)]
-#![warn(clippy::excessive_indentation)]
+#![warn(clippy::excessive_nesting)]
 
 #[rustfmt::skip]
 fn main() {

tests/ui-toml/excessive_nesting/excessive_nesting.rs

@@ -0,0 +1,15 @@
+error: this block is too nested
+  --> $DIR/excessive_nesting.rs:8:13
+   |
+LL | /             {
+LL | |                 {
+LL | |                     println!("warning! :)");
+LL | |                 }
+LL | |             }
+   | |_____________^
+   |
+   = help: try refactoring your code, extraction is often both easier to read and less nested
+   = note: `-D clippy::excessive-nesting` implied by `-D warnings`
+
+error: aborting due to previous error
+

tests/ui-toml/excessive_nesting/excessive_nesting.stderr

@@ -24,6 +24,7 @@ error: error reading Clippy's configuration file `$DIR/clippy.toml`: unknown fie
            enforced-import-renames
            enum-variant-name-threshold
            enum-variant-size-threshold
+           excessive-nesting-threshold
            future-size-threshold
            ignore-interior-mutability
            large-error-threshold

tests/ui-toml/toml_unknown_key/conf_unknown_key.stderr

@@ -1,9 +1,15 @@
 #![allow(unused)]
-#![warn(clippy::excessive_indentation)]
+#![warn(clippy::excessive_nesting)]
 
 #[rustfmt::skip]
 use a::{b::{c::{d::{e::{f::{g::{h::{i::j::{k::{l::{m::{n::{o::{p::{}}}}}}}}}}}}}}};
 
+fn a() {}
+
+fn b() {
+    {}
+}
+
 pub mod a {
     pub mod b {
         pub mod c {

tests/ui/excessive_nesting.rs

@@ -0,0 +1,17 @@
+error: this block is too nested
+  --> $DIR/excessive_nesting.rs:58:41
+   |
+LL | / ...                   {
+LL | | ...                       {
+LL | | ...                           {
+LL | | ...                               {
+...  |
+LL | | ...                       }
+LL | | ...                   }
+   | |_______________________^
+   |
+   = help: try refactoring your code, extraction is often both easier to read and less nested
+   = note: `-D clippy::excessive-nesting` implied by `-D warnings`
+
+error: aborting due to previous error
+