Use parentheses when needed in nonminimal_bool lint (rust-lang#14187)

Since comparisons on types not implementing `Ord` (such as `f32`) are
not inverted, they must be enclosed in parentheses when they are
negated.

Fix rust-lang#14184

changelog: [`nonminimal_bool`]: add required parentheses when negating a
binary expression

Author: llogiq

clippy_lints/src/booleans.rs

@@ -3,6 +3,7 @@ use clippy_utils::diagnostics::{span_lint_and_sugg, span_lint_hir_and_then};
 use clippy_utils::eq_expr_value;
 use clippy_utils::msrvs::{self, Msrv};
 use clippy_utils::source::SpanRangeExt;
+use clippy_utils::sugg::Sugg;
 use clippy_utils::ty::{implements_trait, is_type_diagnostic_item};
 use rustc_ast::ast::LitKind;
 use rustc_attr_parsing::RustcVersion;
@@ -353,7 +354,8 @@ impl SuggestContext<'_, '_, '_> {
                         self.output.push_str(&str);
                     } else {
                         self.output.push('!');
-                        self.output.push_str(&terminal.span.get_source_text(self.cx)?);
+                        self.output
+                            .push_str(&Sugg::hir_opt(self.cx, terminal)?.maybe_par().to_string());
                     }
                 },
                 True | False | Not(_) => {

tests/ui/nonminimal_bool.rs

@@ -183,3 +183,9 @@ fn issue_12371(x: usize) -> bool {
 fn many_ops(a: bool, b: bool, c: bool, d: bool, e: bool, f: bool) -> bool {
     (a && c && f) || (!a && b && !d) || (!b && !c && !e) || (d && e && !f)
 }
+
+fn issue14184(a: f32, b: bool) {
+    if !(a < 2.0 && !b) {
+        println!("Hi");
+    }
+}

tests/ui/nonminimal_bool.stderr

@@ -213,5 +213,11 @@ error: this boolean expression can be simplified
 LL |     if !b != !c {}
    |        ^^^^^^^^ help: try: `b != c`
 
-error: aborting due to 29 previous errors
+error: this boolean expression can be simplified
+  --> tests/ui/nonminimal_bool.rs:188:8
+   |
+LL |     if !(a < 2.0 && !b) {
+   |        ^^^^^^^^^^^^^^^^ help: try: `!(a < 2.0) || b`
+
+error: aborting due to 30 previous errors