make `cfg_select` a builtin macro

2 files changed, 52 insertions, 0 deletions

diff --git a/tests/ui/macros/cfg_select.rs b/tests/ui/macros/cfg_select.rs
new file mode 100644
index 00000000000..a4d94836a09
--- /dev/null
+++ b/tests/ui/macros/cfg_select.rs
@@ -0,0 +1,27 @@
+#![feature(cfg_select)]
+#![crate_type = "lib"]
+
+fn print() {
+    println!(cfg_select! {
+        unix => { "unix" }
+        _ => { "not unix" }
+    });
+}
+
+fn arm_rhs_must_be_in_braces() -> i32 {
+    cfg_select! {
+        true => 1
+        //~^ ERROR: expected `{`, found `1`
+    }
+}
+
+cfg_select! {
+    _ => {}
+    true => {}
+    //~^ WARN unreachable rule
+}
+
+cfg_select! {
+    //~^ ERROR none of the rules in this `cfg_select` evaluated to true
+    false => {}
+}
diff --git a/tests/ui/macros/cfg_select.stderr b/tests/ui/macros/cfg_select.stderr
new file mode 100644
index 00000000000..fef5e95a6bc
--- /dev/null
+++ b/tests/ui/macros/cfg_select.stderr
@@ -0,0 +1,25 @@
+error: expected `{`, found `1`
+  --> $DIR/cfg_select.rs:13:17
+   |
+LL |         true => 1
+   |                 ^ expected `{`
+
+warning: unreachable rule
+  --> $DIR/cfg_select.rs:20:5
+   |
+LL |     _ => {}
+   |     - always matches
+LL |     true => {}
+   |     ^^^^ this rules is never reached
+
+error: none of the rules in this `cfg_select` evaluated to true
+  --> $DIR/cfg_select.rs:24:1
+   |
+LL | / cfg_select! {
+LL | |
+LL | |     false => {}
+LL | | }
+   | |_^
+
+error: aborting due to 2 previous errors; 1 warning emitted
+