Add parallel rustc ui tests

Author: SparrowLii

src/tools/tidy/src/ui_tests.rs

@@ -14,7 +14,7 @@ use std::path::{Path, PathBuf};
 // #73494.
 const ENTRY_LIMIT: usize = 900;
 const ISSUES_ENTRY_LIMIT: usize = 1807;
-const ROOT_ENTRY_LIMIT: usize = 870;
+const ROOT_ENTRY_LIMIT: usize = 871;
 
 const EXPECTED_TEST_FILE_EXTENSIONS: &[&str] = &[
     "rs",     // test source files

tests/ui/parallel-rustc/hello_world.rs

@@ -0,0 +1,6 @@
+// compile-flags: -Z threads=8
+// run-pass
+
+fn main() {
+    println!("Hello world!");
+}

tests/ui/parallel-rustc/issue-111520.rs

@@ -0,0 +1,18 @@
+// compile-flags: -Z threads=16
+// run-pass
+
+#[repr(transparent)]
+struct Sched {
+    i: i32,
+}
+impl Sched {
+    extern "C" fn get(self) -> i32 { self.i }
+}
+
+fn main() {
+    let s = Sched { i: 4 };
+    let f = || -> i32 {
+        s.get()
+    };
+    println!("f: {}", f());
+}

tests/ui/parallel-rustc/issue-111528.rs

@@ -0,0 +1,16 @@
+// compile-flags: -Z threads=16
+// build-fail
+
+#![crate_type="rlib"]
+#![allow(warnings)]
+
+#[export_name="fail"]
+pub fn a() {
+}
+
+#[export_name="fail"]
+pub fn b() {
+//~^ Error symbol `fail` is already defined
+}
+
+fn main() {}

tests/ui/parallel-rustc/issue-111528.stderr

@@ -0,0 +1,8 @@
+error: symbol `fail` is already defined
+  --> $DIR/issue-111528.rs:12:1
+   |
+LL | pub fn b() {
+   | ^^^^^^^^^^
+
+error: aborting due to 1 previous error
+

tests/ui/parallel-rustc/issue-118205-2.rs

@@ -0,0 +1,7 @@
+// compile-flags:-C extra-filename=-1 -Z threads=16
+// no-prefer-dynamic
+// build-pass
+#![crate_name = "crateresolve1"]
+#![crate_type = "lib"]
+
+pub fn f() -> isize { 10 }

tests/ui/parallel-rustc/issue-118205.rs

@@ -0,0 +1,22 @@
+// compile-flags: -Z threads=16
+// build-pass
+
+pub static GLOBAL: isize = 3;
+
+static GLOBAL0: isize = 4;
+
+pub static GLOBAL2: &'static isize = &GLOBAL0;
+
+pub fn verify_same(a: &'static isize) {
+    let a = a as *const isize as usize;
+    let b = &GLOBAL as *const isize as usize;
+    assert_eq!(a, b);
+}
+
+pub fn verify_same2(a: &'static isize) {
+    let a = a as *const isize as usize;
+    let b = GLOBAL2 as *const isize as usize;
+    assert_eq!(a, b);
+}
+
+fn main() {}

tests/ui/parallel-rustc/issue-94654.rs

@@ -0,0 +1,24 @@
+// compile-flags: -Z threads=16
+
+use std::collections::BTreeSet;
+
+#[derive(Hash)]
+pub enum ElemDerived {
+//~^ ERROR E0072
+//~| ERROR E0391
+    A(ElemDerived)
+}
+
+pub enum Elem {
+    Derived(ElemDerived)
+}
+
+pub struct Set(BTreeSet<Elem>);
+
+impl Set {
+    pub fn into_iter(self) -> impl Iterator<Item = Elem> {
+        self.0.into_iter()
+    }
+}
+
+fn main() {}

tests/ui/parallel-rustc/issue-94654.stderr

@@ -0,0 +1,32 @@
+error[E0072]: recursive type `ElemDerived` has infinite size
+  --> $DIR/issue-94654.rs:6:1
+   |
+LL | pub enum ElemDerived {
+   | ^^^^^^^^^^^^^^^^^^^^
+...
+LL |     A(ElemDerived)
+   |       ----------- recursive without indirection
+   |
+help: insert some indirection (e.g., a `Box`, `Rc`, or `&`) to break the cycle
+   |
+LL |     A(Box<ElemDerived>)
+   |       ++++           +
+
+error[E0391]: cycle detected when computing drop-check constraints for `ElemDerived`
+  --> $DIR/issue-94654.rs:6:1
+   |
+LL | pub enum ElemDerived {
+   | ^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: ...which immediately requires computing drop-check constraints for `ElemDerived` again
+note: cycle used when computing drop-check constraints for `Elem`
+  --> $DIR/issue-94654.rs:12:1
+   |
+LL | pub enum Elem {
+   | ^^^^^^^^^^^^^
+   = note: see https://rustc-dev-guide.rust-lang.org/overview.html#queries and https://rustc-dev-guide.rust-lang.org/query.html for more information
+
+error: aborting due to 2 previous errors
+
+Some errors have detailed explanations: E0072, E0391.
+For more information about an error, try `rustc --explain E0072`.