don't lint on if let

Author: Centri3

clippy_lints/src/needless_if.rs

@@ -1,6 +1,9 @@
 use clippy_utils::{diagnostics::span_lint_and_sugg, is_from_proc_macro, source::snippet_with_applicability};
 use rustc_errors::Applicability;
-use rustc_hir::{Expr, ExprKind, Node, intravisit::{Visitor, walk_expr}};
+use rustc_hir::{
+    intravisit::{walk_expr, Visitor},
+    Expr, ExprKind, Node,
+};
 use rustc_lint::{LateContext, LateLintPass, LintContext};
 use rustc_middle::lint::in_external_macro;
 use rustc_session::{declare_lint_pass, declare_tool_lint};

tests/ui/needless_if.rs

@@ -48,7 +48,10 @@ fn main() {
     if let true = true {}
     if let true = true && true {}
     if true && let true = true {}
-    if { if let true = true && true { true } else { false } } && true {}
+    if {
+        if let true = true && true { true } else { false }
+    } && true
+    {}
     external! { if (true) {} }
     with_span! {
         span