Move assert_matches to an inner module

compiler/rustc_middle/src/ich/impls_syntax.rs

@@ -6,6 +6,7 @@ use crate::ich::StableHashingContext;
 use rustc_ast as ast;
 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
 use rustc_span::{BytePos, NormalizedPos, SourceFile};
+use std::assert::assert_matches;
 
 use smallvec::SmallVec;
 

compiler/rustc_mir/src/interpret/memory.rs

@@ -6,6 +6,7 @@
 //! integer. It is crucial that these operations call `check_align` *before*
 //! short-circuiting the empty case!
 
+use std::assert::assert_matches;
 use std::borrow::Cow;
 use std::collections::VecDeque;
 use std::convert::{TryFrom, TryInto};

library/core/src/lib.rs

@@ -179,6 +179,16 @@ use prelude::v1::*;
 #[macro_use]
 mod macros;
 
+// We don't export this through #[macro_export] for now, to avoid breakage.
+// See https://github.com/rust-lang/rust/issues/82913
+#[cfg(not(test))]
+#[unstable(feature = "assert_matches", issue = "82775")]
+/// Unstable module containing the unstable `assert_matches` macro.
+pub mod assert {
+    #[unstable(feature = "assert_matches", issue = "82775")]
+    pub use crate::macros::{assert_matches, debug_assert_matches};
+}
+
 #[macro_use]
 mod internal_macros;
 

library/core/src/macros/mod.rs

@@ -126,6 +126,8 @@ macro_rules! assert_ne {
 /// ```
 /// #![feature(assert_matches)]
 ///
+/// use std::assert::assert_matches;
+///
 /// let a = 1u32.checked_add(2);
 /// let b = 1u32.checked_sub(2);
 /// assert_matches!(a, Some(_));
@@ -134,10 +136,10 @@ macro_rules! assert_ne {
 /// let c = Ok("abc".to_string());
 /// assert_matches!(c, Ok(x) | Err(x) if x.len() < 100);
 /// ```
-#[macro_export]
 #[unstable(feature = "assert_matches", issue = "82775")]
 #[allow_internal_unstable(core_panic)]
-macro_rules! assert_matches {
+#[rustc_macro_transparency = "semitransparent"]
+pub macro assert_matches {
     ($left:expr, $( $pattern:pat_param )|+ $( if $guard: expr )? $(,)?) => ({
         match $left {
             $( $pattern )|+ $( if $guard )? => {}
@@ -149,7 +151,7 @@ macro_rules! assert_matches {
                 );
             }
         }
-    });
+    }),
     ($left:expr, $( $pattern:pat_param )|+ $( if $guard: expr )?, $($arg:tt)+) => ({
         match $left {
             $( $pattern )|+ $( if $guard )? => {}
@@ -161,7 +163,7 @@ macro_rules! assert_matches {
                 );
             }
         }
-    });
+    }),
 }
 
 /// Asserts that a boolean expression is `true` at runtime.
@@ -283,6 +285,8 @@ macro_rules! debug_assert_ne {
 /// ```
 /// #![feature(assert_matches)]
 ///
+/// use std::assert::debug_assert_matches;
+///
 /// let a = 1u32.checked_add(2);
 /// let b = 1u32.checked_sub(2);
 /// debug_assert_matches!(a, Some(_));
@@ -294,8 +298,9 @@ macro_rules! debug_assert_ne {
 #[macro_export]
 #[unstable(feature = "assert_matches", issue = "82775")]
 #[allow_internal_unstable(assert_matches)]
-macro_rules! debug_assert_matches {
-    ($($arg:tt)*) => (if $crate::cfg!(debug_assertions) { $crate::assert_matches!($($arg)*); })
+#[rustc_macro_transparency = "semitransparent"]
+pub macro debug_assert_matches($($arg:tt)*) {
+    if $crate::cfg!(debug_assertions) { $crate::assert::assert_matches!($($arg)*); }
 }
 
 /// Returns whether the given expression matches any of the given patterns.

library/std/src/lib.rs

@@ -548,8 +548,8 @@ pub use std_detect::{
 #[stable(feature = "rust1", since = "1.0.0")]
 #[allow(deprecated, deprecated_in_future)]
 pub use core::{
-    assert_eq, assert_matches, assert_ne, debug_assert, debug_assert_eq, debug_assert_matches,
-    debug_assert_ne, matches, r#try, todo, unimplemented, unreachable, write, writeln,
+    assert_eq, assert_ne, debug_assert, debug_assert_eq, debug_assert_ne, matches, r#try, todo,
+    unimplemented, unreachable, write, writeln,
 };
 
 // Re-export built-in macros defined through libcore.

src/test/ui/macros/assert-matches-macro-msg.rs

@@ -6,6 +6,8 @@
 
 #![feature(assert_matches)]
 
+use std::assert::assert_matches;
+
 fn main() {
     assert_matches!(1 + 1, 3, "1 + 1 definitely should be 3");
 }

src/test/ui/matches2021.rs

@@ -6,6 +6,8 @@
 
 #![feature(assert_matches)]
 
+use std::assert::assert_matches;
+
 fn main() {
     assert!(matches!((), ()));
     assert_matches!((), ());

src/test/ui/resolve/resolve-hint-macro.rs

@@ -1,4 +1,4 @@
 fn main() {
-    assert(true);
-    //~^ ERROR expected function, found macro `assert`
+    assert_eq(1, 1);
+    //~^ ERROR expected function, found macro `assert_eq`
 }

src/test/ui/resolve/resolve-hint-macro.stderr

@@ -1,13 +1,13 @@
-error[E0423]: expected function, found macro `assert`
+error[E0423]: expected function, found macro `assert_eq`
   --> $DIR/resolve-hint-macro.rs:2:5
    |
-LL |     assert(true);
-   |     ^^^^^^ not a function
+LL |     assert_eq(1, 1);
+   |     ^^^^^^^^^ not a function
    |
 help: use `!` to invoke the macro
    |
-LL |     assert!(true);
-   |           ^
+LL |     assert_eq!(1, 1);
+   |              ^
 
 error: aborting due to previous error