From 39f190b72ccab9a166529f6ae1c8d5d562b15571 Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Sun, 13 Jun 2021 16:05:43 +0300
Subject: internal: refactor unresolved extern crate diagnostic

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

(limited to 'crates/ide/src/diagnostics')

diff --git a/crates/ide/src/diagnostics/unresolved_extern_crate.rs b/crates/ide/src/diagnostics/unresolved_extern_crate.rs
new file mode 100644
index 000000000..2ea79c2ee
--- /dev/null
+++ b/crates/ide/src/diagnostics/unresolved_extern_crate.rs
@@ -0,0 +1,49 @@
+use crate::diagnostics::{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::diagnostics::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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