Fix bug checking wrong side of binary expression, add more test cases

Author: MarcusGrass

src/expr.rs

@@ -282,8 +282,8 @@ pub(crate) fn format_expr(
                 match lhs.kind {
                     ast::ExprKind::Lit(token_lit) => lit_ends_in_dot(&token_lit),
                     ast::ExprKind::Unary(_, ref expr) => needs_space_before_range(context, expr),
-                    ast::ExprKind::Binary(_, ref expr, _) => {
-                        needs_space_before_range(context, expr)
+                    ast::ExprKind::Binary(_, _, ref rhs_expr) => {
+                        needs_space_before_range(context, rhs_expr)
                     }
                     _ => false,
                 }

tests/source/issue-6059/repro.rs

@@ -0,0 +1,3 @@
+fn float_range_tests() {
+    self.coords.x -= rng.gen_range(-self.radius / 2. .. self.radius / 2.);
+}

tests/target/issue-6059/additional.rs

@@ -0,0 +1,6 @@
+fn float_range_tests() {
+    let _range = 3. / 2. ..4.;
+    let _range = 3.0 / 2. ..4.0;
+    let _range = 3.0 / 2.0..4.0;
+    let _range = 3. / 2.0..4.0;
+}

tests/target/issue-6059/no_trailing_dot.rs

@@ -0,0 +1,3 @@
+fn float_range_tests() {
+    self.coords.x -= rng.gen_range(-self.radius / 2. ..self.radius / 2.);
+}