Allow option_map_unwrap_or(_else)

This fixes #1192.

Author: llogiq

README.md

@@ -283,8 +283,8 @@ name
 [nonsensical_open_options](https://github.com/Manishearth/rust-clippy/wiki#nonsensical_open_options)                 | warn    | nonsensical combination of options for opening a file
 [not_unsafe_ptr_arg_deref](https://github.com/Manishearth/rust-clippy/wiki#not_unsafe_ptr_arg_deref)                 | warn    | public functions dereferencing raw pointer arguments but not marked `unsafe`
 [ok_expect](https://github.com/Manishearth/rust-clippy/wiki#ok_expect)                                               | warn    | using `ok().expect()`, which gives worse error messages than calling `expect` directly on the Result
-[option_map_unwrap_or](https://github.com/Manishearth/rust-clippy/wiki#option_map_unwrap_or)                         | warn    | using `Option.map(f).unwrap_or(a)`, which is more succinctly expressed as `map_or(a, f)`
-[option_map_unwrap_or_else](https://github.com/Manishearth/rust-clippy/wiki#option_map_unwrap_or_else)               | warn    | using `Option.map(f).unwrap_or_else(g)`, which is more succinctly expressed as `map_or_else(g, f)`
+[option_map_unwrap_or](https://github.com/Manishearth/rust-clippy/wiki#option_map_unwrap_or)                         | allow   | using `Option.map(f).unwrap_or(a)`, which is more succinctly expressed as `map_or(a, f)`
+[option_map_unwrap_or_else](https://github.com/Manishearth/rust-clippy/wiki#option_map_unwrap_or_else)               | allow   | using `Option.map(f).unwrap_or_else(g)`, which is more succinctly expressed as `map_or_else(g, f)`
 [option_unwrap_used](https://github.com/Manishearth/rust-clippy/wiki#option_unwrap_used)                             | allow   | using `Option.unwrap()`, which should at least get a better message using `expect()`
 [or_fun_call](https://github.com/Manishearth/rust-clippy/wiki#or_fun_call)                                           | warn    | using any `*or` method with a function call, which suggests `*or_else`
 [out_of_bounds_indexing](https://github.com/Manishearth/rust-clippy/wiki#out_of_bounds_indexing)                     | deny    | out of bounds constant indexing

clippy_lints/src/lib.rs

@@ -271,6 +271,8 @@ pub fn register_plugins(reg: &mut rustc_plugin::Registry) {
         matches::SINGLE_MATCH_ELSE,
         mem_forget::MEM_FORGET,
         methods::FILTER_MAP,
+        methods::OPTION_MAP_UNWRAP_OR,
+        methods::OPTION_MAP_UNWRAP_OR_ELSE,
         methods::OPTION_UNWRAP_USED,
         methods::RESULT_UNWRAP_USED,
         methods::WRONG_PUB_SELF_CONVENTION,
@@ -370,8 +372,6 @@ pub fn register_plugins(reg: &mut rustc_plugin::Registry) {
         methods::ITER_NTH,
         methods::NEW_RET_NO_SELF,
         methods::OK_EXPECT,
-        methods::OPTION_MAP_UNWRAP_OR,
-        methods::OPTION_MAP_UNWRAP_OR_ELSE,
         methods::OR_FUN_CALL,
         methods::SEARCH_IS_SOME,
         methods::SHOULD_IMPLEMENT_TRAIT,

clippy_lints/src/methods.rs

@@ -168,7 +168,7 @@ declare_lint! {
 /// ```
 declare_lint! {
     pub OPTION_MAP_UNWRAP_OR,
-    Warn,
+    Allow,
     "using `Option.map(f).unwrap_or(a)`, which is more succinctly expressed as \
      `map_or(a, f)`"
 }
@@ -186,7 +186,7 @@ declare_lint! {
 /// ```
 declare_lint! {
     pub OPTION_MAP_UNWRAP_OR_ELSE,
-    Warn,
+    Allow,
     "using `Option.map(f).unwrap_or_else(g)`, which is more succinctly expressed as \
      `map_or_else(g, f)`"
 }