Rename 'flat_map' → 'flat_map_identity'

CHANGELOG.md

@@ -947,7 +947,7 @@ Released 2018-09-13
 [`filter_map_next`]: https://rust-lang.github.io/rust-clippy/master/index.html#filter_map_next
 [`filter_next`]: https://rust-lang.github.io/rust-clippy/master/index.html#filter_next
 [`find_map`]: https://rust-lang.github.io/rust-clippy/master/index.html#find_map
-[`flat_map`]: https://rust-lang.github.io/rust-clippy/master/index.html#flat_map
+[`flat_map_identity`]: https://rust-lang.github.io/rust-clippy/master/index.html#flat_map_identity
 [`float_arithmetic`]: https://rust-lang.github.io/rust-clippy/master/index.html#float_arithmetic
 [`float_cmp`]: https://rust-lang.github.io/rust-clippy/master/index.html#float_cmp
 [`float_cmp_const`]: https://rust-lang.github.io/rust-clippy/master/index.html#float_cmp_const

clippy_lints/src/lib.rs

@@ -643,7 +643,7 @@ pub fn register_plugins(reg: &mut rustc_plugin::Registry<'_>, conf: &Conf) {
         methods::FILTER_MAP,
         methods::FILTER_MAP_NEXT,
         methods::FIND_MAP,
-        methods::FLAT_MAP,
+        methods::FLAT_MAP_IDENTITY,
         methods::MAP_FLATTEN,
         methods::OPTION_MAP_UNWRAP_OR,
         methods::OPTION_MAP_UNWRAP_OR_ELSE,

clippy_lints/src/methods/mod.rs

@@ -357,7 +357,7 @@ declare_clippy_lint! {
     /// ```rust
     /// iter.flatten()
     /// ```
-    pub FLAT_MAP,
+    pub FLAT_MAP_IDENTITY,
     pedantic,
     "call to `flat_map` where `flatten` is sufficient"
 }
@@ -912,7 +912,7 @@ declare_lint_pass!(Methods => [
     FILTER_NEXT,
     FILTER_MAP,
     FILTER_MAP_NEXT,
-    FLAT_MAP,
+    FLAT_MAP_IDENTITY,
     FIND_MAP,
     MAP_FLATTEN,
     ITER_NTH,
@@ -953,7 +953,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for Methods {
             ["map", "find"] => lint_find_map(cx, expr, arg_lists[1], arg_lists[0]),
             ["flat_map", "filter"] => lint_filter_flat_map(cx, expr, arg_lists[1], arg_lists[0]),
             ["flat_map", "filter_map"] => lint_filter_map_flat_map(cx, expr, arg_lists[1], arg_lists[0]),
-            ["flat_map", ..] => lint_flat_map(cx, expr, arg_lists[0]),
+            ["flat_map", ..] => lint_flat_map_identity(cx, expr, arg_lists[0]),
             ["flatten", "map"] => lint_map_flatten(cx, expr, arg_lists[1]),
             ["is_some", "find"] => lint_search_is_some(cx, expr, "find", arg_lists[1], arg_lists[0]),
             ["is_some", "position"] => lint_search_is_some(cx, expr, "position", arg_lists[1], arg_lists[0]),
@@ -2165,7 +2165,11 @@ fn lint_filter_map_flat_map<'a, 'tcx>(
 }
 
 /// lint use of `flat_map` for `Iterators` where `flatten` would be sufficient
-fn lint_flat_map<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, expr: &'tcx hir::Expr, flat_map_args: &'tcx [hir::Expr]) {
+fn lint_flat_map_identity<'a, 'tcx>(
+    cx: &LateContext<'a, 'tcx>,
+    expr: &'tcx hir::Expr,
+    flat_map_args: &'tcx [hir::Expr],
+) {
     if_chain! {
         if match_trait_method(cx, expr, &paths::ITERATOR);
 
@@ -2183,7 +2187,7 @@ fn lint_flat_map<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, expr: &'tcx hir::Expr, fl
         then {
             let msg = "called `flat_map(|x| x)` on an `Iterator`. \
                        This can be simplified by calling `flatten().`";
-            span_lint(cx, FLAT_MAP, expr.span, msg);
+            span_lint(cx, FLAT_MAP_IDENTITY, expr.span, msg);
         }
     }
 
@@ -2201,7 +2205,7 @@ fn lint_flat_map<'a, 'tcx>(cx: &LateContext<'a, 'tcx>, expr: &'tcx hir::Expr, fl
         then {
             let msg = "called `flat_map(std::convert::identity)` on an `Iterator`. \
                        This can be simplified by calling `flatten().`";
-            span_lint(cx, FLAT_MAP, expr.span, msg);
+            span_lint(cx, FLAT_MAP_IDENTITY, expr.span, msg);
         }
     }
 }

src/lintlist/mod.rs

@@ -554,7 +554,7 @@ pub const ALL_LINTS: [Lint; 310] = [
         module: "methods",
     },
     Lint {
-        name: "flat_map",
+        name: "flat_map_identity",
         group: "pedantic",
         desc: "call to `flat_map` where `flatten` is sufficient",
         deprecation: None,

tests/ui/unnecessary_flat_map.rs

@@ -1,4 +1,4 @@
-#![warn(clippy::flat_map)]
+#![warn(clippy::flat_map_identity)]
 
 use std::convert;
 

tests/ui/unnecessary_flat_map.stderr

@@ -4,7 +4,7 @@ error: called `flat_map(|x| x)` on an `Iterator`. This can be simplified by call
 LL |     iterator.flat_map(|x| x);
    |     ^^^^^^^^^^^^^^^^^^^^^^^^
    |
-   = note: `-D clippy::flat-map` implied by `-D warnings`
+   = note: `-D clippy::flat-map-identity` implied by `-D warnings`
 
 error: called `flat_map(std::convert::identity)` on an `Iterator`. This can be simplified by calling `flatten().`
   --> $DIR/unnecessary_flat_map.rs:10:23