Add MSRV check for bool::then_some

Author: joshtriplett

clippy_lints/src/methods/mod.rs

@@ -2737,7 +2737,12 @@ impl Methods {
                     }
                 },
                 ("take", []) => needless_option_take::check(cx, expr, recv),
-                ("then", [arg]) => unnecessary_lazy_eval::check(cx, expr, recv, arg, "then_some"),
+                ("then", [arg]) => {
+                    if !meets_msrv(self.msrv, msrvs::BOOL_THEN_SOME) {
+                        return;
+                    }
+                    unnecessary_lazy_eval::check(cx, expr, recv, arg, "then_some");
+                },
                 ("to_os_string" | "to_owned" | "to_path_buf" | "to_vec", []) => {
                     implicit_clone::check(cx, name, expr, recv);
                 },

clippy_utils/src/msrvs.rs

@@ -12,6 +12,7 @@ macro_rules! msrv_aliases {
 
 // names may refer to stabilized feature flags or library items
 msrv_aliases! {
+    1,62,0 { BOOL_THEN_SOME }
     1,53,0 { OR_PATTERNS, MANUAL_BITS, BTREE_MAP_RETAIN, BTREE_SET_RETAIN }
     1,52,0 { STR_SPLIT_ONCE, REM_EUCLID_CONST }
     1,51,0 { BORROW_AS_PTR, UNSIGNED_ABS }