Rollup merge of rust-lang#50806 - oli-obk:gesundheit, r=ehuss

Add `bless` x.py subcommand for easy ui test replacement

fixes rust-lang#49815

r? @nikomatsakis

Author: Mark-Simulacrum

src/bootstrap/bin/rustc.rs

@@ -297,7 +297,12 @@ fn main() {
     }
 
     if verbose > 1 {
-        eprintln!("rustc command: {:?}", cmd);
+        eprintln!(
+            "rustc command: {:?}={:?} {:?}",
+            bootstrap::util::dylib_path_var(),
+            env::join_paths(&dylib_path).unwrap(),
+            cmd,
+        );
         eprintln!("sysroot: {:?}", sysroot);
         eprintln!("libdir: {:?}", libdir);
     }

src/bootstrap/builder.rs

@@ -1460,6 +1460,7 @@ mod __test {
             rustc_args: vec![],
             fail_fast: true,
             doc_tests: DocTests::No,
+            bless: false,
         };
 
         let build = Build::new(config);

src/bootstrap/flags.rs

@@ -59,6 +59,8 @@ pub enum Subcommand {
     },
     Test {
         paths: Vec<PathBuf>,
+        /// Whether to automatically update stderr/stdout files
+        bless: bool,
         test_args: Vec<String>,
         rustc_args: Vec<String>,
         fail_fast: bool,
@@ -173,6 +175,7 @@ To learn more about a subcommand, run `./x.py <subcommand> -h`");
                 );
                 opts.optflag("", "no-doc", "do not run doc tests");
                 opts.optflag("", "doc", "only run doc tests");
+                opts.optflag("", "bless", "update all stderr/stdout files of failing ui tests");
             },
             "bench" => { opts.optmulti("", "test-args", "extra arguments", "ARGS"); },
             "clean" => { opts.optflag("", "all", "clean all build artifacts"); },
@@ -258,6 +261,7 @@ Arguments:
         ./x.py test src/test/run-pass
         ./x.py test src/libstd --test-args hash_map
         ./x.py test src/libstd --stage 0
+        ./x.py test src/test/ui --bless
 
     If no arguments are passed then the complete artifacts for that stage are
     compiled and tested.
@@ -322,6 +326,7 @@ Arguments:
             "test" => {
                 Subcommand::Test {
                     paths,
+                    bless: matches.opt_present("bless"),
                     test_args: matches.opt_strs("test-args"),
                     rustc_args: matches.opt_strs("rustc-args"),
                     fail_fast: !matches.opt_present("no-fail-fast"),
@@ -424,6 +429,13 @@ impl Subcommand {
             _ => DocTests::Yes,
         }
     }
+
+    pub fn bless(&self) -> bool {
+        match *self {
+            Subcommand::Test { bless, .. } => bless,
+            _ => false,
+        }
+    }
 }
 
 fn split(s: Vec<String>) -> Vec<String> {

src/bootstrap/test.rs

@@ -47,6 +47,16 @@ pub enum TestKind {
     Bench,
 }
 
+impl From<Kind> for TestKind {
+    fn from(kind: Kind) -> Self {
+        match kind {
+            Kind::Test => TestKind::Test,
+            Kind::Bench => TestKind::Bench,
+            _ => panic!("unexpected kind in crate: {:?}", kind)
+        }
+    }
+}
+
 impl TestKind {
     // Return the cargo subcommand for this test kind
     fn subcommand(self) -> &'static str {
@@ -951,6 +961,10 @@ impl Step for Compiletest {
         cmd.arg("--host").arg(&*compiler.host);
         cmd.arg("--llvm-filecheck").arg(builder.llvm_filecheck(builder.config.build));
 
+        if builder.config.cmd.bless() {
+            cmd.arg("--bless");
+        }
+
         if let Some(ref nodejs) = builder.config.nodejs {
             cmd.arg("--nodejs").arg(nodejs);
         }
@@ -1342,13 +1356,7 @@ impl Step for CrateLibrustc {
 
         for krate in builder.in_tree_crates("rustc-main") {
             if run.path.ends_with(&krate.path) {
-                let test_kind = if builder.kind == Kind::Test {
-                    TestKind::Test
-                } else if builder.kind == Kind::Bench {
-                    TestKind::Bench
-                } else {
-                    panic!("unexpected builder.kind in crate: {:?}", builder.kind);
-                };
+                let test_kind = builder.kind.into();
 
                 builder.ensure(CrateLibrustc {
                     compiler,
@@ -1394,13 +1402,7 @@ impl Step for CrateNotDefault {
         let builder = run.builder;
         let compiler = builder.compiler(builder.top_stage, run.host);
 
-        let test_kind = if builder.kind == Kind::Test {
-            TestKind::Test
-        } else if builder.kind == Kind::Bench {
-            TestKind::Bench
-        } else {
-            panic!("unexpected builder.kind in crate: {:?}", builder.kind);
-        };
+        let test_kind = builder.kind.into();
 
         builder.ensure(CrateNotDefault {
             compiler,
@@ -1461,13 +1463,7 @@ impl Step for Crate {
         let compiler = builder.compiler(builder.top_stage, run.host);
 
         let make = |mode: Mode, krate: &CargoCrate| {
-            let test_kind = if builder.kind == Kind::Test {
-                TestKind::Test
-            } else if builder.kind == Kind::Bench {
-                TestKind::Bench
-            } else {
-                panic!("unexpected builder.kind in crate: {:?}", builder.kind);
-            };
+            let test_kind = builder.kind.into();
 
             builder.ensure(Crate {
                 compiler,
@@ -1625,13 +1621,7 @@ impl Step for CrateRustdoc {
     fn make_run(run: RunConfig) {
         let builder = run.builder;
 
-        let test_kind = if builder.kind == Kind::Test {
-            TestKind::Test
-        } else if builder.kind == Kind::Bench {
-            TestKind::Bench
-        } else {
-            panic!("unexpected builder.kind in crate: {:?}", builder.kind);
-        };
+        let test_kind = builder.kind.into();
 
         builder.ensure(CrateRustdoc {
             host: run.host,

src/test/COMPILER_TESTS.md

@@ -140,13 +140,9 @@ check that the test compiles successfully.
 ### Editing and updating the reference files
 
 If you have changed the compiler's output intentionally, or you are
-making a new test, you can use the script `ui/update-references.sh` to
-update the references. When you run the test framework, it will report
-various errors: in those errors is a command you can use to run the
-`ui/update-references.sh` script, which will then copy over the files
-from the build directory and use them as the new reference. You can
-also just run `ui/update-all-references.sh`. In both cases, you can run
-the script with `--help` to get a help message.
+making a new test, you can pass `--bless` to the command you used to
+run the tests. This will then copy over the files
+from the build directory and use them as the new reference.
 
 ### Normalization
 

src/test/ui/E0508.ast.nll.stderr

@@ -0,0 +1,9 @@
+error[E0508]: cannot move out of type `[NonCopy; 1]`, a non-copy array
+  --> $DIR/E0508.rs:18:18
+   |
+LL |     let _value = array[0];  //[ast]~ ERROR [E0508]
+   |                  ^^^^^^^^ cannot move out of here
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0508`.

src/test/ui/E0508.ast.stderr

@@ -0,0 +1,12 @@
+error[E0508]: cannot move out of type `[NonCopy; 1]`, a non-copy array
+  --> $DIR/E0508.rs:18:18
+   |
+LL |     let _value = array[0];  //[ast]~ ERROR [E0508]
+   |                  ^^^^^^^^
+   |                  |
+   |                  cannot move out of here
+   |                  help: consider using a reference instead: `&array[0]`
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0508`.

src/test/ui/E0508.mir.stderr

@@ -0,0 +1,9 @@
+error[E0508]: cannot move out of type `[NonCopy; 1]`, a non-copy array
+  --> $DIR/E0508.rs:18:18
+   |
+LL |     let _value = array[0];  //[ast]~ ERROR [E0508]
+   |                  ^^^^^^^^ cannot move out of here
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0508`.

src/test/ui/E0508.rs

@@ -0,0 +1,20 @@
+// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// revisions: ast mir
+//[mir]compile-flags: -Z borrowck=mir
+
+struct NonCopy;
+
+fn main() {
+    let array = [NonCopy; 1];
+    let _value = array[0];  //[ast]~ ERROR [E0508]
+                            //[mir]~^ ERROR [E0508]
+}

src/tools/compiletest/src/common.rs

@@ -118,6 +118,9 @@ impl CompareMode {
 
 #[derive(Clone)]
 pub struct Config {
+    /// Whether to overwrite stderr/stdout files instead of complaining about changes in output
+    pub bless: bool,
+
     /// The library paths required for running the compiler
     pub compile_lib_path: PathBuf,