Prepare beta 1.51.0

Cargo.toml

@@ -106,11 +106,5 @@ rustc-std-workspace-core = { path = 'library/rustc-std-workspace-core' }
 rustc-std-workspace-alloc = { path = 'library/rustc-std-workspace-alloc' }
 rustc-std-workspace-std = { path = 'library/rustc-std-workspace-std' }
 
-# This crate's integration with libstd is a bit wonky, so we use a submodule
-# instead of a crates.io dependency. Make sure everything else in the repo is
-# also using the submodule, however, so we can avoid duplicate copies of the
-# source code for this crate.
-backtrace = { path = "library/backtrace" }
-
 [patch."https://github.com/rust-lang/rust-clippy"]
 clippy_lints = { path = "src/tools/clippy/clippy_lints" }

src/bootstrap/compile.rs

@@ -1057,8 +1057,11 @@ impl Step for Assemble {
             let src_exe = exe("llvm-dwp", target_compiler.host);
             let dst_exe = exe("rust-llvm-dwp", target_compiler.host);
             let llvm_config_bin = builder.ensure(native::Llvm { target: target_compiler.host });
-            let llvm_bin_dir = llvm_config_bin.parent().unwrap();
-            builder.copy(&llvm_bin_dir.join(&src_exe), &libdir_bin.join(&dst_exe));
+            if !builder.config.dry_run {
+                let llvm_bin_dir = output(Command::new(llvm_config_bin).arg("--bindir"));
+                let llvm_bin_dir = Path::new(llvm_bin_dir.trim());
+                builder.copy(&llvm_bin_dir.join(&src_exe), &libdir_bin.join(&dst_exe));
+            }
         }
 
         // Ensure that `libLLVM.so` ends up in the newly build compiler directory,

src/bootstrap/dist.rs

@@ -1021,7 +1021,13 @@ impl Step for Rls {
         let rls = builder
             .ensure(tool::Rls { compiler, target, extra_features: Vec::new() })
             .or_else(|| {
-                missing_tool("RLS", builder.build.config.missing_tools);
+                // We ignore failure on aarch64 Windows because RLS currently
+                // fails to build, due to winapi 0.2 not supporting aarch64.
+                missing_tool(
+                    "RLS",
+                    builder.build.config.missing_tools
+                        || (target.triple.contains("aarch64") && target.triple.contains("windows")),
+                );
                 None
             })?;
 

src/ci/pgo.sh

@@ -2,6 +2,8 @@
 
 set -euxo pipefail
 
+export RUSTC_BOOTSTRAP=1
+
 rm -rf /tmp/rustc-pgo
 
 python2.7 ../x.py build --target=$PGO_HOST --host=$PGO_HOST \

src/ci/run.sh

@@ -68,7 +68,7 @@ fi
 #
 # FIXME: need a scheme for changing this `nightly` value to `beta` and `stable`
 #        either automatically or manually.
-export RUST_RELEASE_CHANNEL=nightly
+export RUST_RELEASE_CHANNEL=beta
 
 # Always set the release channel for bootstrap; this is normally not important (i.e., only dist
 # builds would seem to matter) but in practice bootstrap wants to know whether we're targeting

src/stage0.txt

@@ -12,14 +12,14 @@
 # stable release's version number. `date` is the date where the release we're
 # bootstrapping off was released.
 
-date: 2020-12-30
-rustc: beta
+date: 2021-02-09
+rustc: 1.50.0
 
 # We use a nightly rustfmt to format the source because it solves some
 # bootstrapping issues with use of new syntax in this repo. If you're looking at
 # the beta/stable branch, this key should be omitted, as we don't want to depend
 # on rustfmt from nightly there.
-rustfmt: nightly-2021-01-28
+#rustfmt: nightly-2021-01-28
 
 # When making a stable release the process currently looks like:
 #
@@ -39,4 +39,4 @@ rustfmt: nightly-2021-01-28
 # looking at a beta source tarball and it's uncommented we'll shortly comment it
 # out.
 
-#dev: 1
+dev: 1

src/test/ui-fulldeps/session-derive-errors.stderr

@@ -1,25 +1,20 @@
 error: `#[derive(SessionDiagnostic)]` can only be used on structs
   --> $DIR/session-derive-errors.rs:28:1
    |
-LL | / #[error = "E0123"]
-LL | |
-LL | | enum SessionDiagnosticOnEnum {
-LL | |     Foo,
-LL | |     Bar,
-LL | | }
-   | |_^
+LL | #[error = "E0123"]
+   | ^
 
 error: `#[label = ...]` is not a valid SessionDiagnostic struct attribute
   --> $DIR/session-derive-errors.rs:37:1
    |
 LL | #[label = "This is in the wrong place"]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   | ^
 
 error: `#[suggestion = ...]` is not a valid SessionDiagnostic field attribute
   --> $DIR/session-derive-errors.rs:44:5
    |
 LL |     #[suggestion = "this is the wrong kind of attribute"]
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |     ^
 
 error: `error` specified multiple times
   --> $DIR/session-derive-errors.rs:52:11
@@ -37,21 +32,21 @@ error: `code` not specified
   --> $DIR/session-derive-errors.rs:67:1
    |
 LL | struct ErrorCodeNotProvided {}
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   | ^^^^^^
    |
    = help: use the [code = "..."] attribute to set this diagnostic's error code 
 
 error: the `#[message = "..."]` attribute can only be applied to fields of type Span
   --> $DIR/session-derive-errors.rs:95:5
    |
 LL |     #[message = "this message is applied to a String field"]
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |     ^
 
 error: `name` doesn't refer to a field on this type
   --> $DIR/session-derive-errors.rs:102:1
    |
 LL | #[message = "This error has a field, and references {name}"]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   | ^
 
 error: invalid format string: expected `'}'` but string was terminated
   --> $DIR/session-derive-errors.rs:110:1
@@ -77,59 +72,53 @@ error: The `#[label = ...]` attribute can only be applied to fields of type Span
   --> $DIR/session-derive-errors.rs:138:5
    |
 LL |     #[label = "See here"]
-   |     ^^^^^^^^^^^^^^^^^^^^^
+   |     ^
 
 error: `nonsense` is not a valid key for `#[suggestion(...)]`
   --> $DIR/session-derive-errors.rs:163:18
    |
 LL |     #[suggestion(nonsense = "This is nonsense")]
-   |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |                  ^^^^^^^^
 
 error: `msg` is not a valid key for `#[suggestion(...)]`
   --> $DIR/session-derive-errors.rs:171:18
    |
 LL |     #[suggestion(msg = "This is a suggestion")]
-   |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |                  ^^^
 
 error: missing suggestion message
   --> $DIR/session-derive-errors.rs:179:7
    |
 LL |     #[suggestion(code = "This is suggested code")]
-   |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |       ^^^^^^^^^^
    |
    = help: provide a suggestion message using #[suggestion(message = "...")]
 
 error: wrong field type for suggestion
   --> $DIR/session-derive-errors.rs:194:5
    |
-LL | /     #[suggestion(message = "This is a message", code = "This is suggested code")]
-LL | |
-LL | |     suggestion: Applicability,
-   | |_____________________________^
+LL |     #[suggestion(message = "This is a message", code = "This is suggested code")]
+   |     ^
    |
    = help: #[suggestion(...)] should be applied to fields of type Span or (Span, Applicability)
 
 error: type of field annotated with `#[suggestion(...)]` contains more than one Span
   --> $DIR/session-derive-errors.rs:209:5
    |
-LL | /     #[suggestion(message = "This is a message", code = "This is suggested code")]
-LL | |
-LL | |     suggestion: (Span, Span, Applicability),
-   | |___________________________________________^
+LL |     #[suggestion(message = "This is a message", code = "This is suggested code")]
+   |     ^
 
 error: type of field annotated with `#[suggestion(...)]` contains more than one Applicability
   --> $DIR/session-derive-errors.rs:217:5
    |
-LL | /     #[suggestion(message = "This is a message", code = "This is suggested code")]
-LL | |
-LL | |     suggestion: (Applicability, Applicability, Span),
-   | |____________________________________________________^
+LL |     #[suggestion(message = "This is a message", code = "This is suggested code")]
+   |     ^
 
 error: invalid annotation list `#[label(...)]`
   --> $DIR/session-derive-errors.rs:225:7
    |
 LL |     #[label("wrong kind of annotation for label")]
-   |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |       ^^^^^
 
 error: aborting due to 18 previous errors
 

src/tools/tidy/src/deps.rs

@@ -67,7 +67,6 @@ const PERMITTED_DEPENDENCIES: &[&str] = &[
     "arrayvec",
     "atty",
     "autocfg",
-    "backtrace",
     "bitflags",
     "block-buffer",
     "block-padding",