Stabilize #[track_caller].

Does not yet make its constness stable, though. Use of
`Location::caller` in const contexts is still gated by
`#![feature(const_caller_location)]`.

src/doc/unstable-book/src/language-features/track-caller.md

@@ -1,5 +0,0 @@
-# `track_caller`
-
-The tracking issue for this feature is: [#47809](https://github.com/rust-lang/rust/issues/47809).
-
-------------------------

src/libcore/lib.rs

@@ -118,7 +118,7 @@
 #![feature(staged_api)]
 #![feature(std_internals)]
 #![feature(stmt_expr_attributes)]
-#![feature(track_caller)]
+#![cfg_attr(bootstrap, feature(track_caller))]
 #![feature(transparent_unions)]
 #![feature(unboxed_closures)]
 #![feature(unsized_locals)]

src/libcore/macros/mod.rs

@@ -1,6 +1,6 @@
 #[doc(include = "panic.md")]
 #[macro_export]
-#[allow_internal_unstable(core_panic, track_caller)]
+#[allow_internal_unstable(core_panic, const_caller_location)]
 #[stable(feature = "core", since = "1.6.0")]
 macro_rules! panic {
     () => (

src/libcore/panic.rs

@@ -190,7 +190,6 @@ impl<'a> Location<'a> {
     /// # Examples
     ///
     /// ```
-    /// #![feature(track_caller)]
     /// use core::panic::Location;
     ///
     /// /// Returns the [`Location`] at which it is called.
@@ -206,7 +205,7 @@ impl<'a> Location<'a> {
     ///
     /// let fixed_location = get_just_one_location();
     /// assert_eq!(fixed_location.file(), file!());
-    /// assert_eq!(fixed_location.line(), 15);
+    /// assert_eq!(fixed_location.line(), 14);
     /// assert_eq!(fixed_location.column(), 5);
     ///
     /// // running the same untracked function in a different location gives us the same result
@@ -217,7 +216,7 @@ impl<'a> Location<'a> {
     ///
     /// let this_location = get_caller_location();
     /// assert_eq!(this_location.file(), file!());
-    /// assert_eq!(this_location.line(), 29);
+    /// assert_eq!(this_location.line(), 28);
     /// assert_eq!(this_location.column(), 21);
     ///
     /// // running the tracked function in a different location produces a different value
@@ -226,13 +225,8 @@ impl<'a> Location<'a> {
     /// assert_ne!(this_location.line(), another_location.line());
     /// assert_ne!(this_location.column(), another_location.column());
     /// ```
-    // FIXME: When stabilizing this method, please also update the documentation
+    #[stable(feature = "track_caller", since = "1.46.0")]
-    // of `intrinsics::caller_location`.
+    #[rustc_const_unstable(feature = "const_caller_location", issue = "47809")]
-    #[unstable(
-        feature = "track_caller",
-        reason = "uses #[track_caller] which is not yet stable",
-        issue = "47809"
-    )]
     #[track_caller]
     pub const fn caller() -> &'static Location<'static> {
         crate::intrinsics::caller_location()

src/librustc_error_codes/error_codes/E0736.md

@@ -3,8 +3,6 @@
 Erroneous code example:
 
 ```compile_fail,E0736
-#![feature(track_caller)]
-
 #[naked]
 #[track_caller]
 fn foo() {}

src/librustc_error_codes/error_codes/E0737.md

@@ -5,8 +5,6 @@ restrictions.
 Erroneous code example:
 
 ```compile_fail,E0737
-#![feature(track_caller)]
-
 #[track_caller]
 extern "C" fn foo() {}
 ```

src/librustc_error_codes/error_codes/E0739.md

@@ -3,7 +3,6 @@
 Erroneous code example:
 
 ```compile_fail,E0739
-#![feature(track_caller)]
 #[track_caller]
 struct Bar {
     a: u8,

src/librustc_errors/lib.rs

@@ -5,7 +5,7 @@
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/")]
 #![feature(crate_visibility_modifier)]
 #![feature(nll)]
-#![feature(track_caller)]
+#![cfg_attr(bootstrap, feature(track_caller))]
 
 pub use emitter::ColorConfig;
 

src/librustc_feature/accepted.rs

@@ -265,6 +265,9 @@ declare_features! (
     (accepted, const_if_match, "1.45.0", Some(49146), None),
     /// Allows the use of `loop` and `while` in constants.
     (accepted, const_loop, "1.45.0", Some(52000), None),
+    /// Allows `#[track_caller]` to be used which provides
+    /// accurate caller location reporting during panic (RFC 2091).
+    (accepted, track_caller, "1.46.0", Some(47809), None),
 
     // -------------------------------------------------------------------------
     // feature-group-end: accepted features

src/librustc_feature/active.rs

@@ -494,10 +494,6 @@ declare_features! (
     /// Allows the use of raw-dylibs (RFC 2627).
     (active, raw_dylib, "1.40.0", Some(58713), None),
 
-    /// Allows `#[track_caller]` to be used which provides
-    /// accurate caller location reporting during panic (RFC 2091).
-    (active, track_caller, "1.40.0", Some(47809), None),
-
     /// Allows making `dyn Trait` well-formed even if `Trait` is not object safe.
     /// In that case, `dyn Trait: Trait` does not hold. Moreover, coercions and
     /// casts in safe Rust to `dyn Trait` for such a `Trait` is also forbidden.

src/librustc_feature/builtin_attrs.rs

@@ -260,6 +260,7 @@ pub const BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[
     ungated!(cold, Whitelisted, template!(Word)),
     ungated!(no_builtins, Whitelisted, template!(Word)),
     ungated!(target_feature, Whitelisted, template!(List: r#"enable = "name""#)),
+    ungated!(track_caller, Whitelisted, template!(Word)),
     gated!(
         no_sanitize, Whitelisted,
         template!(List: "address, memory, thread"),
@@ -333,7 +334,6 @@ pub const BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[
     gated!(ffi_returns_twice, Whitelisted, template!(Word), experimental!(ffi_returns_twice)),
     gated!(ffi_pure, Whitelisted, template!(Word), experimental!(ffi_pure)),
     gated!(ffi_const, Whitelisted, template!(Word), experimental!(ffi_const)),
-    gated!(track_caller, Whitelisted, template!(Word), experimental!(track_caller)),
     gated!(
         register_attr, CrateLevel, template!(List: "attr1, attr2, ..."),
         experimental!(register_attr),

src/librustc_middle/lib.rs

@@ -42,7 +42,7 @@
 #![feature(or_patterns)]
 #![feature(range_is_empty)]
 #![feature(min_specialization)]
-#![feature(track_caller)]
+#![cfg_attr(bootstrap, feature(track_caller))]
 #![feature(trusted_len)]
 #![feature(stmt_expr_attributes)]
 #![feature(test)]

src/libstd/lib.rs

@@ -316,7 +316,7 @@
 #![feature(toowned_clone_into)]
 #![feature(total_cmp)]
 #![feature(trace_macros)]
-#![feature(track_caller)]
+#![cfg_attr(bootstrap, feature(track_caller))]
 #![feature(try_reserve)]
 #![feature(unboxed_closures)]
 #![feature(untagged_unions)]

src/test/ui/asm/sym.rs

@@ -3,7 +3,7 @@
 // only-linux
 // run-pass
 
-#![feature(asm, track_caller, thread_local)]
+#![feature(asm, thread_local)]
 
 extern "C" fn f1() -> i32 {
     111

src/test/ui/feature-gates/feature-gate-track_caller.rs

@@ -1,5 +0,0 @@
-#[track_caller]
-fn f() {}
-//~^^ ERROR the `#[track_caller]` attribute is an experimental feature
-
-fn main() {}

src/test/ui/feature-gates/feature-gate-track_caller.stderr

@@ -1,12 +0,0 @@
-error[E0658]: the `#[track_caller]` attribute is an experimental feature
-  --> $DIR/feature-gate-track_caller.rs:1:1
-   |
-LL | #[track_caller]
-   | ^^^^^^^^^^^^^^^
-   |
-   = note: see issue #47809 <https://github.com/rust-lang/rust/issues/47809> for more information
-   = help: add `#![feature(track_caller)]` to the crate attributes to enable
-
-error: aborting due to previous error
-
-For more information about this error, try `rustc --explain E0658`.

src/test/ui/macros/issue-68060.rs

@@ -1,5 +1,3 @@
-#![feature(track_caller)]
-
 fn main() {
     (0..)
         .map(

src/test/ui/macros/issue-68060.stderr

@@ -1,5 +1,5 @@
 error[E0658]: `#[target_feature(..)]` can only be applied to `unsafe` functions
-  --> $DIR/issue-68060.rs:6:13
+  --> $DIR/issue-68060.rs:4:13
    |
 LL |             #[target_feature(enable = "")]
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -11,13 +11,13 @@ LL |             |_| (),
    = help: add `#![feature(target_feature_11)]` to the crate attributes to enable
 
 error: the feature named `` is not valid for this target
-  --> $DIR/issue-68060.rs:6:30
+  --> $DIR/issue-68060.rs:4:30
    |
 LL |             #[target_feature(enable = "")]
    |                              ^^^^^^^^^^^ `` is not valid for this target
 
 error[E0737]: `#[track_caller]` requires Rust ABI
-  --> $DIR/issue-68060.rs:9:13
+  --> $DIR/issue-68060.rs:7:13
    |
 LL |             #[track_caller]
    |             ^^^^^^^^^^^^^^^

src/test/ui/numbers-arithmetic/saturating-float-casts.rs

@@ -9,7 +9,6 @@
 // merged.
 
 #![feature(test, stmt_expr_attributes)]
-#![feature(track_caller)]
 #![deny(overflowing_literals)]
 extern crate test;
 

src/test/ui/rfc-2091-track-caller/call-chain.rs

@@ -1,7 +1,5 @@
 // run-pass
 
-#![feature(track_caller)]
-
 use std::panic::Location;
 
 struct Foo;

src/test/ui/rfc-2091-track-caller/caller-location-fnptr-rt-ctfe-equiv.rs

@@ -6,7 +6,7 @@
 // run-pass
 // compile-flags: -Z unleash-the-miri-inside-of-you
 
-#![feature(core_intrinsics, const_caller_location, track_caller, const_fn)]
+#![feature(core_intrinsics, const_caller_location, const_fn)]
 
 type L = &'static std::panic::Location<'static>;
 

src/test/ui/rfc-2091-track-caller/caller-location-intrinsic.rs

@@ -1,7 +1,5 @@
 // run-pass
 
-#![feature(track_caller)]
-
 #[inline(never)]
 #[track_caller]
 fn codegen_caller_loc() -> &'static core::panic::Location<'static> {
@@ -15,13 +13,13 @@ macro_rules! caller_location_from_macro {
 fn main() {
     let loc = codegen_caller_loc();
     assert_eq!(loc.file(), file!());
-    assert_eq!(loc.line(), 16);
+    assert_eq!(loc.line(), 14);
     assert_eq!(loc.column(), 15);
 
     // `Location::caller()` in a macro should behave similarly to `file!` and `line!`,
     // i.e. point to where the macro was invoked, instead of the macro itself.
     let loc2 = caller_location_from_macro!();
     assert_eq!(loc2.file(), file!());
-    assert_eq!(loc2.line(), 23);
+    assert_eq!(loc2.line(), 21);
     assert_eq!(loc2.column(), 16);
 }

src/test/ui/rfc-2091-track-caller/const-caller-location.rs

@@ -1,6 +1,6 @@
 // run-pass
 
-#![feature(const_fn, track_caller)]
+#![feature(const_caller_location, const_fn)]
 
 use std::panic::Location;
 

src/test/ui/rfc-2091-track-caller/diverging-caller-location.rs

@@ -6,8 +6,6 @@
 //! we don't inspect the location returned -- it would be difficult to distinguish between the
 //! explicit panic and a failed assertion. That it compiles and runs is enough for this one.
 
-#![feature(track_caller)]
-
 #[track_caller]
 fn doesnt_return() -> ! {
     let _location = core::panic::Location::caller();

src/test/ui/rfc-2091-track-caller/error-odd-syntax.rs

@@ -1,5 +1,3 @@
-#![feature(track_caller)]
-
 #[track_caller(1)]
 fn f() {}
 //~^^ ERROR malformed `track_caller` attribute input

src/test/ui/rfc-2091-track-caller/error-odd-syntax.stderr

@@ -1,5 +1,5 @@
 error: malformed `track_caller` attribute input
-  --> $DIR/error-odd-syntax.rs:3:1
+  --> $DIR/error-odd-syntax.rs:1:1
    |
 LL | #[track_caller(1)]
    | ^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[track_caller]`

src/test/ui/rfc-2091-track-caller/error-with-invalid-abi.rs

@@ -1,5 +1,3 @@
-#![feature(track_caller)]
-
 #[track_caller]
 extern "C" fn f() {}
 //~^^ ERROR `#[track_caller]` requires Rust ABI

src/test/ui/rfc-2091-track-caller/error-with-invalid-abi.stderr

@@ -1,11 +1,11 @@
 error[E0737]: `#[track_caller]` requires Rust ABI
-  --> $DIR/error-with-invalid-abi.rs:3:1
+  --> $DIR/error-with-invalid-abi.rs:1:1
    |
 LL | #[track_caller]
    | ^^^^^^^^^^^^^^^
 
 error[E0737]: `#[track_caller]` requires Rust ABI
-  --> $DIR/error-with-invalid-abi.rs:8:5
+  --> $DIR/error-with-invalid-abi.rs:6:5
    |
 LL |     #[track_caller]
    |     ^^^^^^^^^^^^^^^

src/test/ui/rfc-2091-track-caller/error-with-naked.rs

@@ -1,4 +1,4 @@
-#![feature(naked_functions, track_caller)]
+#![feature(naked_functions)]
 
 #[track_caller] //~ ERROR cannot use `#[track_caller]` with `#[naked]`
 #[naked]

src/test/ui/rfc-2091-track-caller/intrinsic-wrapper.rs

@@ -1,7 +1,5 @@
 // run-pass
 
-#![feature(track_caller)]
-
 macro_rules! caller_location_from_macro {
     () => (core::panic::Location::caller());
 }
@@ -9,13 +7,13 @@ macro_rules! caller_location_from_macro {
 fn main() {
     let loc = core::panic::Location::caller();
     assert_eq!(loc.file(), file!());
-    assert_eq!(loc.line(), 10);
+    assert_eq!(loc.line(), 8);
     assert_eq!(loc.column(), 15);
 
     // `Location::caller()` in a macro should behave similarly to `file!` and `line!`,
     // i.e. point to where the macro was invoked, instead of the macro itself.
     let loc2 = caller_location_from_macro!();
     assert_eq!(loc2.file(), file!());
-    assert_eq!(loc2.line(), 17);
+    assert_eq!(loc2.line(), 15);
     assert_eq!(loc2.column(), 16);
 }

src/test/ui/rfc-2091-track-caller/only-for-fns.rs

@@ -1,5 +1,3 @@
-#![feature(track_caller)]
-
 #[track_caller]
 struct S;
 //~^^ ERROR attribute should be applied to function

src/test/ui/rfc-2091-track-caller/only-for-fns.stderr

@@ -1,5 +1,5 @@
 error[E0739]: attribute should be applied to function
-  --> $DIR/only-for-fns.rs:3:1
+  --> $DIR/only-for-fns.rs:1:1
    |
 LL | #[track_caller]
    | ^^^^^^^^^^^^^^^

src/test/ui/rfc-2091-track-caller/pass.rs

@@ -1,6 +1,4 @@
 // run-pass
-#![feature(track_caller)]
-
 #[track_caller]
 fn f() {}
 

src/test/ui/rfc-2091-track-caller/track-caller-attribute.rs

@@ -1,7 +1,5 @@
 // run-pass
 
-#![feature(track_caller)]
-
 use std::panic::Location;
 
 #[track_caller]
@@ -20,21 +18,21 @@ fn nested_tracked() -> &'static Location<'static> {
 fn main() {
     let location = Location::caller();
     assert_eq!(location.file(), file!());
-    assert_eq!(location.line(), 21);
+    assert_eq!(location.line(), 19);
     assert_eq!(location.column(), 20);
 
     let tracked = tracked();
     assert_eq!(tracked.file(), file!());
-    assert_eq!(tracked.line(), 26);
+    assert_eq!(tracked.line(), 24);
     assert_eq!(tracked.column(), 19);
 
     let nested = nested_intrinsic();
     assert_eq!(nested.file(), file!());
-    assert_eq!(nested.line(), 13);
+    assert_eq!(nested.line(), 11);
     assert_eq!(nested.column(), 5);
 
     let contained = nested_tracked();
     assert_eq!(contained.file(), file!());
-    assert_eq!(contained.line(), 17);
+    assert_eq!(contained.line(), 15);
     assert_eq!(contained.column(), 5);
 }

src/test/ui/rfc-2091-track-caller/track-caller-ffi.rs

@@ -1,7 +1,5 @@
 // run-pass
 
-#![feature(track_caller)]
-
 use std::panic::Location;
 
 extern "Rust" {
@@ -30,21 +28,21 @@ mod provides {
 fn main() {
     let location = Location::caller();
     assert_eq!(location.file(), file!());
-    assert_eq!(location.line(), 31);
+    assert_eq!(location.line(), 29);
     assert_eq!(location.column(), 20);
 
     let tracked = unsafe { rust_track_caller_ffi_test_tracked() };
     assert_eq!(tracked.file(), file!());
-    assert_eq!(tracked.line(), 36);
+    assert_eq!(tracked.line(), 34);
     assert_eq!(tracked.column(), 28);
 
     let untracked = unsafe { rust_track_caller_ffi_test_untracked() };
     assert_eq!(untracked.file(), file!());
-    assert_eq!(untracked.line(), 26);
+    assert_eq!(untracked.line(), 24);
     assert_eq!(untracked.column(), 9);
 
     let contained = rust_track_caller_ffi_test_nested_tracked();
     assert_eq!(contained.file(), file!());
-    assert_eq!(contained.line(), 14);
+    assert_eq!(contained.line(), 12);
     assert_eq!(contained.column(), 14);
 }

src/test/ui/rfc-2091-track-caller/tracked-fn-ptr-with-arg.rs

@@ -1,7 +1,5 @@
 // run-pass
 
-#![feature(track_caller)]
-
 fn pass_to_ptr_call<T>(f: fn(T), x: T) {
     f(x);
 }

src/test/ui/rfc-2091-track-caller/tracked-fn-ptr.rs

@@ -1,7 +1,5 @@
 // run-pass
 
-#![feature(track_caller)]
-
 fn ptr_call(f: fn()) {
     f();
 }

src/test/ui/rfc-2091-track-caller/tracked-trait-impls.rs

@@ -1,7 +1,5 @@
 // run-pass
 
-#![feature(track_caller)]
-
 macro_rules! assert_expansion_site_is_tracked {
     () => {{
         let location = std::panic::Location::caller();