Regression test for issue rust-lang#59548.

Author: pnkfelix

src/test/ui/linkage-attr/auxiliary/def_illtyped_external.rs

@@ -0,0 +1,5 @@
+#![feature(linkage)]
+#![crate_type = "lib"]
+
+#[linkage="external"]
+pub static EXTERN: u32 = 0;

src/test/ui/linkage-attr/linkage-requires-raw-ptr.rs

@@ -0,0 +1,10 @@
+// rust-lang/rust#59548: We used to ICE when trying to use a static
+// with a type that violated its own `#[linkage]`.
+
+// aux-build:def_illtyped_external.rs
+
+extern crate def_illtyped_external as dep;
+
+fn main() {
+    println!("{:p}", &dep::EXTERN);
+}

src/test/ui/linkage-attr/linkage-requires-raw-ptr.stderr

@@ -0,0 +1,8 @@
+error: must have type `*const T` or `*mut T` due to `#[linkage]` attribute
+  --> $DIR/auxiliary/def_illtyped_external.rs:5:1
+   |
+LL | pub static EXTERN: u32 = 0;
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to previous error
+