add test

Author: karolzwolak

tests/ui/extern/extern-single-quote-issue-147365.rs

@@ -0,0 +1,9 @@
+//@ needs-rustc-debug-assertions
+
+// https://github.com/rust-lang/rust/issues/147365
+// Ensures we don't trigger debug assert by creating an empty Ident when determining whether
+// the single quote is a raw lifetime.
+
+extern "'" {} //~ ERROR invalid ABI: found `'`
+
+fn main() {}

tests/ui/extern/extern-single-quote-issue-147365.stderr

@@ -0,0 +1,16 @@
+error[E0703]: invalid ABI: found `'`
+  --> $DIR/extern-single-quote-issue-147365.rs:7:8
+   |
+LL | extern "'" {}
+   |        ^^^ invalid ABI
+   |
+   = note: invoke `rustc --print=calling-conventions` for a full list of supported calling conventions
+help: there's a similarly named valid ABI `C`
+   |
+LL - extern "'" {}
+LL + extern "C" {}
+   |
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0703`.