prevent TrivialClone implementations from appearing in rustdoc output

Author: joboet

compiler/rustc_builtin_macros/src/deriving/bounds.rs

@@ -25,6 +25,7 @@ pub(crate) fn expand_deriving_copy(
         is_const,
         is_staged_api_crate: cx.ecfg.features.staged_api(),
         safety: Safety::Default,
+        document: true,
     };
 
     trait_def.expand(cx, mitem, item, push);
@@ -50,6 +51,7 @@ pub(crate) fn expand_deriving_const_param_ty(
         is_const,
         is_staged_api_crate: cx.ecfg.features.staged_api(),
         safety: Safety::Default,
+        document: true,
     };
 
     trait_def.expand(cx, mitem, item, push);

compiler/rustc_builtin_macros/src/deriving/clone.rs

@@ -83,6 +83,9 @@ pub(crate) fn expand_deriving_clone(
             is_const,
             is_staged_api_crate: cx.ecfg.features.staged_api(),
             safety: Safety::Unsafe(DUMMY_SP),
+            // `TrivialClone` is not part of an API guarantee, so it shouldn't
+            // appear in rustdoc output.
+            document: false,
         };
 
         trivial_def.expand_ext(cx, mitem, item, push, true);
@@ -109,6 +112,7 @@ pub(crate) fn expand_deriving_clone(
         is_const,
         is_staged_api_crate: cx.ecfg.features.staged_api(),
         safety: Safety::Default,
+        document: true,
     };
 
     trait_def.expand_ext(cx, mitem, item, push, is_simple)

compiler/rustc_builtin_macros/src/deriving/cmp/eq.rs

@@ -45,6 +45,7 @@ pub(crate) fn expand_deriving_eq(
         is_const,
         is_staged_api_crate: cx.ecfg.features.staged_api(),
         safety: Safety::Default,
+        document: true,
     };
     trait_def.expand_ext(cx, mitem, item, push, true)
 }

compiler/rustc_builtin_macros/src/deriving/cmp/ord.rs

@@ -36,6 +36,7 @@ pub(crate) fn expand_deriving_ord(
         is_const,
         is_staged_api_crate: cx.ecfg.features.staged_api(),
         safety: Safety::Default,
+        document: true,
     };
 
     trait_def.expand(cx, mitem, item, push)

compiler/rustc_builtin_macros/src/deriving/cmp/partial_eq.rs

@@ -31,6 +31,7 @@ pub(crate) fn expand_deriving_partial_eq(
         is_const: false,
         is_staged_api_crate: cx.ecfg.features.staged_api(),
         safety: Safety::Default,
+        document: true,
     };
     structural_trait_def.expand(cx, mitem, item, push);
 
@@ -61,6 +62,7 @@ pub(crate) fn expand_deriving_partial_eq(
         is_const,
         is_staged_api_crate: cx.ecfg.features.staged_api(),
         safety: Safety::Default,
+        document: true,
     };
     trait_def.expand(cx, mitem, item, push)
 }

compiler/rustc_builtin_macros/src/deriving/cmp/partial_ord.rs

@@ -66,6 +66,7 @@ pub(crate) fn expand_deriving_partial_ord(
         is_const,
         is_staged_api_crate: cx.ecfg.features.staged_api(),
         safety: Safety::Default,
+        document: true,
     };
     trait_def.expand(cx, mitem, item, push)
 }

compiler/rustc_builtin_macros/src/deriving/debug.rs

@@ -43,6 +43,7 @@ pub(crate) fn expand_deriving_debug(
         is_const,
         is_staged_api_crate: cx.ecfg.features.staged_api(),
         safety: Safety::Default,
+        document: true,
     };
     trait_def.expand(cx, mitem, item, push)
 }

compiler/rustc_builtin_macros/src/deriving/default.rs

@@ -52,6 +52,7 @@ pub(crate) fn expand_deriving_default(
         is_const,
         is_staged_api_crate: cx.ecfg.features.staged_api(),
         safety: Safety::Default,
+        document: true,
     };
     trait_def.expand(cx, mitem, item, push)
 }

compiler/rustc_builtin_macros/src/deriving/from.rs

@@ -128,6 +128,7 @@ pub(crate) fn expand_deriving_from(
         is_const,
         is_staged_api_crate: cx.ecfg.features.staged_api(),
         safety: Safety::Default,
+        document: true,
     };
 
     from_trait_def.expand(cx, mitem, annotatable, push);

compiler/rustc_builtin_macros/src/deriving/generic/mod.rs

@@ -228,6 +228,9 @@ pub(crate) struct TraitDef<'a> {
 
     /// The safety of the `impl`.
     pub safety: Safety,
+
+    /// Whether the added `impl` should appear in rustdoc output.
+    pub document: bool,
 }
 
 pub(crate) struct MethodDef<'a> {
@@ -829,6 +832,10 @@ impl<'a> TraitDef<'a> {
             )
         }
 
+        if !self.document {
+            attrs.push(cx.attr_nested_word(sym::doc, sym::hidden, self.span));
+        }
+
         cx.item(
             self.span,
             attrs,