4 files changed, 51 insertions, 22 deletions
diff --git a/compiler/rustc_resolve/src/diagnostics.rs b/compiler/rustc_resolve/src/diagnostics.rs
index f879e548f27..09221041031 100644
--- a/compiler/rustc_resolve/src/diagnostics.rs
+++ b/compiler/rustc_resolve/src/diagnostics.rs
@@ -819,7 +819,12 @@ impl<'a, 'tcx> Resolver<'a, 'tcx> {
             ResolutionError::CannotCaptureDynamicEnvironmentInFnItem => {
                 self.dcx().create_err(errs::CannotCaptureDynamicEnvironmentInFnItem { span })
             }
-            ResolutionError::AttemptToUseNonConstantValueInConstant(ident, suggestion, current) => {
+            ResolutionError::AttemptToUseNonConstantValueInConstant {
+                ident,
+                suggestion,
+                current,
+                type_span,
+            } => {
                 // let foo =...
                 //     ^^^ given this Span
                 // ------- get this Span to have an applicable suggestion
@@ -844,6 +849,7 @@ impl<'a, 'tcx> Resolver<'a, 'tcx> {
                                 span: sp,
                                 suggestion,
                                 current,
+                                type_span,
                             }), Some(errs::AttemptToUseNonConstantValueInConstantLabelWithSuggestion {span})),
                             None,
                         )
diff --git a/compiler/rustc_resolve/src/errors.rs b/compiler/rustc_resolve/src/errors.rs
index a4bdd62acbb..79c76e7a976 100644
--- a/compiler/rustc_resolve/src/errors.rs
+++ b/compiler/rustc_resolve/src/errors.rs
@@ -240,16 +240,18 @@ pub(crate) struct AttemptToUseNonConstantValueInConstant<'a> {
 }
 
 #[derive(Subdiagnostic)]
-#[suggestion(
+#[multipart_suggestion(
     resolve_attempt_to_use_non_constant_value_in_constant_with_suggestion,
-    code = "{suggestion} ",
     style = "verbose",
-    applicability = "maybe-incorrect"
+    applicability = "has-placeholders"
 )]
 pub(crate) struct AttemptToUseNonConstantValueInConstantWithSuggestion<'a> {
-    #[primary_span]
+    // #[primary_span]
+    #[suggestion_part(code = "{suggestion} ")]
     pub(crate) span: Span,
     pub(crate) suggestion: &'a str,
+    #[suggestion_part(code = ": /* Type */")]
+    pub(crate) type_span: Option<Span>,
     pub(crate) current: &'a str,
 }
 
diff --git a/compiler/rustc_resolve/src/ident.rs b/compiler/rustc_resolve/src/ident.rs
index 7d531385e21..f1934ff184b 100644
--- a/compiler/rustc_resolve/src/ident.rs
+++ b/compiler/rustc_resolve/src/ident.rs
@@ -1178,21 +1178,41 @@ impl<'a, 'tcx> Resolver<'a, 'tcx> {
                             if let Some(span) = finalize {
                                 let (span, resolution_error) = match item {
                                     None if rib_ident.as_str() == "self" => (span, LowercaseSelf),
-                                    None => (
-                                        rib_ident.span,
-                                        AttemptToUseNonConstantValueInConstant(
-                                            original_rib_ident_def,
-                                            "const",
-                                            "let",
-                                        ),
-                                    ),
+                                    None => {
+                                        // If we have a `let name = expr;`, we have the span for
+                                        // `name` and use that to see if it is followed by a type
+                                        // specifier. If not, then we know we need to suggest
+                                        // `const name: Ty = expr;`. This is a heuristic, it will
+                                        // break down in the presence of macros.
+                                        let sm = self.tcx.sess.source_map();
+                                        let type_span = match sm.span_look_ahead(
+                                            original_rib_ident_def.span,
+                                            ":",
+                                            None,
+                                        ) {
+                                            None => {
+                                                Some(original_rib_ident_def.span.shrink_to_hi())
+                                            }
+                                            Some(_) => None,
+                                        };
+                                        (
+                                            rib_ident.span,
+                                            AttemptToUseNonConstantValueInConstant {
+                                                ident: original_rib_ident_def,
+                                                suggestion: "const",
+                                                current: "let",
+                                                type_span,
+                                            },
+                                        )
+                                    }
                                     Some((ident, kind)) => (
                                         span,
-                                        AttemptToUseNonConstantValueInConstant(
+                                        AttemptToUseNonConstantValueInConstant {
                                             ident,
-                                            "let",
-                                            kind.as_str(),
-                                        ),
+                                            suggestion: "let",
+                                            current: kind.as_str(),
+                                            type_span: None,
+                                        },
                                     ),
                                 };
                                 self.report_error(span, resolution_error);
diff --git a/compiler/rustc_resolve/src/lib.rs b/compiler/rustc_resolve/src/lib.rs
index 7cb5a3fb2fd..3dcb83d65b0 100644
--- a/compiler/rustc_resolve/src/lib.rs
+++ b/compiler/rustc_resolve/src/lib.rs
@@ -236,11 +236,12 @@ enum ResolutionError<'a> {
     /// Error E0434: can't capture dynamic environment in a fn item.
     CannotCaptureDynamicEnvironmentInFnItem,
     /// Error E0435: attempt to use a non-constant value in a constant.
-    AttemptToUseNonConstantValueInConstant(
-        Ident,
-        /* suggestion */ &'static str,
-        /* current */ &'static str,
-    ),
+    AttemptToUseNonConstantValueInConstant {
+        ident: Ident,
+        suggestion: &'static str,
+        current: &'static str,
+        type_span: Option<Span>,
+    },
     /// Error E0530: `X` bindings cannot shadow `Y`s.
     BindingShadowsSomethingUnacceptable {
         shadowing_binding: PatternSource,