From 1d2772c2c7dc0a42d8a9429d24ea41412add61b3 Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Mon, 14 Jun 2021 13:15:05 +0300
Subject: internal: move diagnostics to a new crate

---
 .../ide_diagnostics/src/unresolved_extern_crate.rs | 49 ++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 crates/ide_diagnostics/src/unresolved_extern_crate.rs

(limited to 'crates/ide_diagnostics/src/unresolved_extern_crate.rs')

diff --git a/crates/ide_diagnostics/src/unresolved_extern_crate.rs b/crates/ide_diagnostics/src/unresolved_extern_crate.rs
new file mode 100644
index 000000000..69f07d0b0
--- /dev/null
+++ b/crates/ide_diagnostics/src/unresolved_extern_crate.rs
@@ -0,0 +1,49 @@
+use crate::{Diagnostic, DiagnosticsContext};
+
+// Diagnostic: unresolved-extern-crate
+//
+// This diagnostic is triggered if rust-analyzer is unable to discover referred extern crate.
+pub(super) fn unresolved_extern_crate(
+    ctx: &DiagnosticsContext<'_>,
+    d: &hir::UnresolvedExternCrate,
+) -> Diagnostic {
+    Diagnostic::new(
+        "unresolved-extern-crate",
+        "unresolved extern crate",
+        ctx.sema.diagnostics_display_range(d.decl.clone().map(|it| it.into())).range,
+    )
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::tests::check_diagnostics;
+
+    #[test]
+    fn unresolved_extern_crate() {
+        check_diagnostics(
+            r#"
+//- /main.rs crate:main deps:core
+extern crate core;
+  extern crate doesnotexist;
+//^^^^^^^^^^^^^^^^^^^^^^^^^^ unresolved extern crate
+//- /lib.rs crate:core
+"#,
+        );
+    }
+
+    #[test]
+    fn extern_crate_self_as() {
+        cov_mark::check!(extern_crate_self_as);
+        check_diagnostics(
+            r#"
+//- /lib.rs
+  extern crate doesnotexist;
+//^^^^^^^^^^^^^^^^^^^^^^^^^^ unresolved extern crate
+// Should not error.
+extern crate self as foo;
+struct Foo;
+use foo::Foo as Bar;
+"#,
+        );
+    }
+}
-- 
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