Add a test for compiletest rustc-env & unset-rustc-env directives

src/test/ui/meta/auxiliary/env.rs

@@ -0,0 +1,9 @@
+// Check that aux builds can also use rustc-env, but environment is configured
+// separately from the main test case.
+//
+// rustc-env:COMPILETEST_BAR=bar
+
+pub fn test() {
+    assert_eq!(option_env!("COMPILETEST_FOO"), None);
+    assert_eq!(env!("COMPILETEST_BAR"), "bar");
+}

src/test/ui/meta-expected-error-correct-rev.a.stderr → src/test/ui/meta/expected-error-correct-rev.a.stderr

@@ -1,5 +1,5 @@
 error[E0308]: mismatched types
-  --> $DIR/meta-expected-error-correct-rev.rs:7:18
+  --> $DIR/expected-error-correct-rev.rs:7:18
    |
 LL |     let x: u32 = 22_usize;
    |            ---   ^^^^^^^^ expected `u32`, found `usize`

src/test/ui/meta-expected-error-correct-rev.rs → src/test/ui/meta/expected-error-correct-rev.rs

@@ -1,6 +1,6 @@
 // revisions: a
 
-// Counterpart to `meta-expected-error-wrong-rev.rs`
+// Counterpart to `expected-error-wrong-rev.rs`
 
 #[cfg(a)]
 fn foo() {

src/test/ui/meta-revision-ok.rs → src/test/ui/meta/revision-ok.rs

@@ -1,5 +1,5 @@
 // Meta test for compiletest: check that when we give the right error
-// patterns, the test passes. See all `meta-revision-bad.rs`.
+// patterns, the test passes. See all `revision-bad.rs`.
 
 // run-fail
 // revisions: foo bar

src/test/ui/meta/rustc-env.rs

@@ -0,0 +1,18 @@
+// Compiletest meta test checking that rustc-env and unset-rustc-env directives
+// can be used to configure environment for rustc.
+//
+// run-pass
+// aux-build:env.rs
+// rustc-env:COMPILETEST_FOO=foo
+//
+// An environment variable that is likely to be set, but should be safe to unset.
+// unset-rustc-env:PWD
+
+extern crate env;
+
+fn main() {
+    assert_eq!(env!("COMPILETEST_FOO"), "foo");
+    assert_eq!(option_env!("COMPILETEST_BAR"), None);
+    assert_eq!(option_env!("PWD"), None);
+    env::test();
+}