2 files changed, 35 insertions, 1 deletions

diff --git a/crates/ide/src/diagnostics/inactive_code.rs b/crates/ide/src/diagnostics/inactive_code.rs
index 52f97cb4c..afe333204 100644
--- a/crates/ide/src/diagnostics/inactive_code.rs
+++ b/crates/ide/src/diagnostics/inactive_code.rs
@@ -1,7 +1,10 @@
 use cfg::DnfExpr;
 use stdx::format_to;
 
-use crate::diagnostics::{Diagnostic, DiagnosticsContext};
+use crate::{
+    diagnostics::{Diagnostic, DiagnosticsContext},
+    Severity,
+};
 
 // Diagnostic: inactive-code
 //
@@ -27,6 +30,7 @@ pub(super) fn inactive_code(
         message,
         ctx.sema.diagnostics_display_range(d.node.clone()).range,
     )
+    .severity(Severity::WeakWarning)
     .with_unused(true);
     Some(res)
 }
diff --git a/crates/ide/src/diagnostics/unresolved_proc_macro.rs b/crates/ide/src/diagnostics/unresolved_proc_macro.rs
new file mode 100644
index 000000000..3dc6ab451
--- /dev/null
+++ b/crates/ide/src/diagnostics/unresolved_proc_macro.rs
@@ -0,0 +1,30 @@
+use crate::{
+    diagnostics::{Diagnostic, DiagnosticsContext},
+    Severity,
+};
+
+// Diagnostic: unresolved-proc-macro
+//
+// This diagnostic is shown when a procedural macro can not be found. This usually means that
+// procedural macro support is simply disabled (and hence is only a weak hint instead of an error),
+// but can also indicate project setup problems.
+//
+// If you are seeing a lot of "proc macro not expanded" warnings, you can add this option to the
+// `rust-analyzer.diagnostics.disabled` list to prevent them from showing. Alternatively you can
+// enable support for procedural macros (see `rust-analyzer.procMacro.enable`).
+pub(super) fn unresolved_proc_macro(
+    ctx: &DiagnosticsContext<'_>,
+    d: &hir::UnresolvedProcMacro,
+) -> Diagnostic {
+    // Use more accurate position if available.
+    let display_range = d
+        .precise_location
+        .unwrap_or_else(|| ctx.sema.diagnostics_display_range(d.node.clone()).range);
+    // FIXME: it would be nice to tell the user whether proc macros are currently disabled
+    let message = match &d.macro_name {
+        Some(name) => format!("proc macro `{}` not expanded", name),
+        None => "proc macro not expanded".to_string(),
+    };
+
+    Diagnostic::new("unresolved-proc-macro", message, display_range).severity(Severity::WeakWarning)
+}