Auto merge of #84730 - sexxi-goose:rox-auto-trait, r=nikomatsakis

Add auto traits and clone trait migrations for RFC2229

This PR
- renames the existent RFC2229 migration `disjoint_capture_drop_reorder` to `disjoint_capture_migration`
- add additional migrations for auto traits and clone trait

Closes rust-lang/project-rfc-2229#29
Closes rust-lang/project-rfc-2229#28

r? `@nikomatsakis`

Author: bors

compiler/rustc_hir/src/lang_items.rs

@@ -343,4 +343,7 @@ language_item_table! {
     Range,                   sym::Range,               range_struct,               Target::Struct;
     RangeToInclusive,        sym::RangeToInclusive,    range_to_inclusive_struct,  Target::Struct;
     RangeTo,                 sym::RangeTo,             range_to_struct,            Target::Struct;
+    Send,                    sym::send,                send_trait,                 Target::Trait;
+    UnwindSafe,              sym::unwind_safe,         unwind_safe_trait,          Target::Trait;
+    RefUnwindSafe,           sym::ref_unwind_safe,     ref_unwind_safe_trait,      Target::Trait;
 }

compiler/rustc_lint_defs/src/builtin.rs

@@ -2995,7 +2995,7 @@ declare_lint_pass! {
         UNSUPPORTED_NAKED_FUNCTIONS,
         MISSING_ABI,
         SEMICOLON_IN_EXPRESSIONS_FROM_MACROS,
-        DISJOINT_CAPTURE_DROP_REORDER,
+        DISJOINT_CAPTURE_MIGRATION,
         LEGACY_DERIVE_HELPERS,
         PROC_MACRO_BACK_COMPAT,
         OR_PATTERNS_BACK_COMPAT,
@@ -3027,14 +3027,17 @@ declare_lint! {
 }
 
 declare_lint! {
-    /// The `disjoint_capture_drop_reorder` lint detects variables that aren't completely
+    /// The `disjoint_capture_migration` lint detects variables that aren't completely
     /// captured when the feature `capture_disjoint_fields` is enabled and it affects the Drop
     /// order of at least one path starting at this variable.
+    /// It can also detect when a variable implements a trait, but one of its field does not and
+    /// the field is captured by a closure and used with the assumption that said field implements
+    /// the same trait as the root variable.
     ///
-    /// ### Example
+    /// ### Example of drop reorder
     ///
     /// ```rust,compile_fail
-    /// # #![deny(disjoint_capture_drop_reorder)]
+    /// # #![deny(disjoint_capture_migration)]
     /// # #![allow(unused)]
     /// struct FancyInteger(i32);
     ///
@@ -3065,10 +3068,35 @@ declare_lint! {
     ///
     /// In the above example `p.y` will be dropped at the end of `f` instead of with `c` if
     /// the feature `capture_disjoint_fields` is enabled.
-    pub DISJOINT_CAPTURE_DROP_REORDER,
+    ///
+    /// ### Example of auto-trait
+    ///
+    /// ```rust,compile_fail
+    /// #![deny(disjoint_capture_migration)]
+    /// use std::thread;
+    ///
+    /// struct Pointer (*mut i32);
+    /// unsafe impl Send for Pointer {}
+    ///
+    /// fn main() {
+    ///     let mut f = 10;
+    ///     let fptr = Pointer(&mut f as *mut i32);
+    ///     thread::spawn(move || unsafe {
+    ///         *fptr.0 = 20;
+    ///     });
+    /// }
+    /// ```
+    ///
+    /// {{produces}}
+    ///
+    /// ### Explanation
+    ///
+    /// In the above example `fptr.0` is captured when feature `capture_disjoint_fields` is enabled.
+    /// The field is of type *mut i32 which doesn't implement Send, making the code invalid as the
+    /// field cannot be sent between thread safely.
+    pub DISJOINT_CAPTURE_MIGRATION,
     Allow,
-    "Drop reorder because of `capture_disjoint_fields`"
-
+    "Drop reorder and auto traits error because of `capture_disjoint_fields`"
 }
 
 declare_lint_pass!(UnusedDocComment => [UNUSED_DOC_COMMENTS]);

compiler/rustc_span/src/symbol.rs

@@ -939,6 +939,7 @@ symbols! {
         receiver,
         recursion_limit,
         reexport_test_harness_main,
+        ref_unwind_safe,
         reference,
         reflect,
         reg,
@@ -1060,6 +1061,7 @@ symbols! {
         self_in_typedefs,
         self_struct_ctor,
         semitransparent,
+        send,
         send_trait,
         shl,
         shl_assign,
@@ -1281,6 +1283,7 @@ symbols! {
         unused_qualifications,
         unwind,
         unwind_attributes,
+        unwind_safe,
         unwrap,
         unwrap_or,
         use_extern_macros,