resolve: improve "try using tuple struct" message

This commit improves the tuple struct case added in rust-lang#77341
so that the context is mentioned in more of the message.

Signed-off-by: David Wood <david@davidtw.co>

compiler/rustc_resolve/src/late/diagnostics.rs

@@ -1341,29 +1341,29 @@ impl<'a: 'ast, 'ast> LateResolutionVisitor<'a, '_, 'ast> {
 
             let non_suggestable_variant_count = variants.len() - suggestable_variants.len();
 
+            let source_msg = if source.is_call() {
+                "to construct"
+            } else if matches!(source, PathSource::TupleStruct(..)) {
+                "to match against"
+            } else {
+                unreachable!()
+            };
+
             if !suggestable_variants.is_empty() {
                 let msg = if non_suggestable_variant_count == 0 && suggestable_variants.len() == 1 {
-                    "try using the enum's variant"
+                    format!("try {} the enum's variant", source_msg)
                 } else {
-                    "try using one of the enum's variants"
+                    format!("try {} one of the enum's variants", source_msg)
                 };
 
                 err.span_suggestions(
                     span,
-                    msg,
+                    &msg,
                     suggestable_variants.drain(..),
                     Applicability::MaybeIncorrect,
                 );
             }
 
-            let source_msg = if source.is_call() {
-                "to construct"
-            } else if matches!(source, PathSource::TupleStruct(..)) {
-                "to match against"
-            } else {
-                unreachable!()
-            };
-
             // If the enum has no tuple variants..
             if non_suggestable_variant_count == variants.len() {
                 err.help(&format!("the enum has no tuple variants {}", source_msg));

src/test/ui/did_you_mean/issue-43871-enum-instead-of-variant.stderr

@@ -2,23 +2,23 @@ error[E0423]: expected function, tuple struct or tuple variant, found enum `Opti
   --> $DIR/issue-43871-enum-instead-of-variant.rs:19:13
    |
 LL |     let x = Option(1);
-   |             ^^^^^^ help: try using one of the enum's variants: `std::option::Option::Some`
+   |             ^^^^^^ help: try to construct one of the enum's variants: `std::option::Option::Some`
    |
    = help: you might have meant to construct the enum's non-tuple variant
 
 error[E0532]: expected tuple struct or tuple variant, found enum `Option`
   --> $DIR/issue-43871-enum-instead-of-variant.rs:21:12
    |
 LL |     if let Option(_) = x {
-   |            ^^^^^^ help: try using one of the enum's variants: `std::option::Option::Some`
+   |            ^^^^^^ help: try to match against one of the enum's variants: `std::option::Option::Some`
    |
    = help: you might have meant to match against the enum's non-tuple variant
 
 error[E0532]: expected tuple struct or tuple variant, found enum `Example`
   --> $DIR/issue-43871-enum-instead-of-variant.rs:27:12
    |
 LL |     if let Example(_) = y {
-   |            ^^^^^^^ help: try using one of the enum's variants: `Example::Ex`
+   |            ^^^^^^^ help: try to match against one of the enum's variants: `Example::Ex`
    |
    = help: you might have meant to match against the enum's non-tuple variant
 note: the enum is defined here

src/test/ui/issues/issue-73427.stderr

@@ -118,7 +118,7 @@ LL | |     Tuple(),
 LL | |     Unit,
 LL | | }
    | |_^
-help: try using one of the enum's variants
+help: try to construct one of the enum's variants
    |
 LL |     let x = A::TupleWithFields(3);
    |             ^^^^^^^^^^^^^^^^^^
@@ -143,7 +143,7 @@ LL | |     Tuple(),
 LL | |     Unit,
 LL | | }
    | |_^
-help: try using one of the enum's variants
+help: try to match against one of the enum's variants
    |
 LL |     if let A::TupleWithFields(3) = x { }
    |            ^^^^^^^^^^^^^^^^^^