chore: add a witness for enum_variant_missing

src/lints/enum_variant_missing.ron

@@ -19,6 +19,8 @@ SemverQuery(
                         }
 
                         variant {
+                            kind: __typename @output
+
                             variant_name: name @output @tag
                             public_api_eligible @filter(op: "=", value: ["$true"])
 
@@ -56,4 +58,7 @@ SemverQuery(
     },
     error_message: "A publicly-visible enum has at least one variant that is no longer available under its prior name. It may have been renamed or removed entirely.",
     per_result_error_template: Some("variant {{enum_name}}::{{variant_name}}, previously in file {{span_filename}}:{{span_begin_line}}"),
+    witness: (
+        hint_template: r#"let witness = {{join "::" path}}::{{variant_name}}{{#if (eq kind "StructVariant")}}{...}{{/if}}{{#if (eq kind "TupleVariant")}}(...){{/if}};"#,
+    ),
 )

test_crates/enum_variant_missing/new/src/lib.rs

@@ -1,3 +1,11 @@
-pub enum VariantWillBeRemoved {
+pub enum PlainVariantWillBeRemoved {
     Foo,
 }
+
+pub enum TupleVariantWillBeRemoved {
+    Foo(usize),
+}
+
+pub enum StructVariantWillBeRemoved {
+    Foo { bar: usize },
+}

test_crates/enum_variant_missing/old/src/lib.rs

@@ -1,10 +1,21 @@
-pub enum VariantWillBeRemoved {
+pub enum PlainVariantWillBeRemoved {
     Foo,
-
     /// Testing: <https://doc.rust-lang.org/cargo/reference/semver.html#item-remove>
     Bar,
 }
 
+pub enum TupleVariantWillBeRemoved {
+    Foo(usize),
+    /// Testing: <https://doc.rust-lang.org/cargo/reference/semver.html#item-remove>
+    Bar(usize),
+}
+
+pub enum StructVariantWillBeRemoved {
+    Foo { bar: usize },
+    /// Testing: <https://doc.rust-lang.org/cargo/reference/semver.html#item-remove>
+    Bar{ bar: usize },
+}
+
 /// This enum should not be reported by the `enum_variant_missing` rule:
 /// it will be removed altogether, so the correct rule to catch it is
 /// the `enum_missing` rule and not the rule for missing variants.

test_outputs/query_execution/enum_missing.snap

@@ -56,7 +56,7 @@ expression: "&query_execution_results"
         String("enum_variant_missing"),
         String("ShouldNotMatch"),
       ]),
-      "span_begin_line": Uint64(11),
+      "span_begin_line": Uint64(22),
       "span_filename": String("src/lib.rs"),
       "visibility_limit": String("public"),
     },

test_outputs/query_execution/enum_variant_missing.snap

@@ -6,6 +6,7 @@ expression: "&query_execution_results"
   "./test_crates/enum_struct_variant_field_missing/": [
     {
       "enum_name": String("IgnoredEnum"),
+      "kind": String("StructVariant"),
       "path": List([
         String("enum_struct_variant_field_missing"),
         String("IgnoredEnum"),
@@ -18,12 +19,37 @@ expression: "&query_execution_results"
   ],
   "./test_crates/enum_variant_missing/": [
     {
-      "enum_name": String("VariantWillBeRemoved"),
+      "enum_name": String("PlainVariantWillBeRemoved"),
+      "kind": String("PlainVariant"),
       "path": List([
         String("enum_variant_missing"),
-        String("VariantWillBeRemoved"),
+        String("PlainVariantWillBeRemoved"),
       ]),
-      "span_begin_line": Uint64(5),
+      "span_begin_line": Uint64(4),
+      "span_filename": String("src/lib.rs"),
+      "variant_name": String("Bar"),
+      "visibility_limit": String("public"),
+    },
+    {
+      "enum_name": String("TupleVariantWillBeRemoved"),
+      "kind": String("TupleVariant"),
+      "path": List([
+        String("enum_variant_missing"),
+        String("TupleVariantWillBeRemoved"),
+      ]),
+      "span_begin_line": Uint64(10),
+      "span_filename": String("src/lib.rs"),
+      "variant_name": String("Bar"),
+      "visibility_limit": String("public"),
+    },
+    {
+      "enum_name": String("StructVariantWillBeRemoved"),
+      "kind": String("StructVariant"),
+      "path": List([
+        String("enum_variant_missing"),
+        String("StructVariantWillBeRemoved"),
+      ]),
+      "span_begin_line": Uint64(16),
       "span_filename": String("src/lib.rs"),
       "variant_name": String("Bar"),
       "visibility_limit": String("public"),

test_outputs/witnesses/enum_variant_missing.snap

@@ -0,0 +1,24 @@
+---
+source: src/query.rs
+description: "Lint `enum_variant_missing` did not have the expected witness output.\nSee https://github.com/obi1kenobi/cargo-semver-checks/blob/main/CONTRIBUTING.md#testing-witnesses\nfor more information."
+expression: "&actual_witnesses"
+---
+[["./test_crates/enum_struct_variant_field_missing/"]]
+filename = 'src/lib.rs'
+begin_line = 14
+hint = 'let witness = enum_struct_variant_field_missing::IgnoredEnum::StructVariantWillBeMissing{...};'
+
+[["./test_crates/enum_variant_missing/"]]
+filename = 'src/lib.rs'
+begin_line = 4
+hint = 'let witness = enum_variant_missing::PlainVariantWillBeRemoved::Bar;'
+
+[["./test_crates/enum_variant_missing/"]]
+filename = 'src/lib.rs'
+begin_line = 10
+hint = 'let witness = enum_variant_missing::TupleVariantWillBeRemoved::Bar(...);'
+
+[["./test_crates/enum_variant_missing/"]]
+filename = 'src/lib.rs'
+begin_line = 16
+hint = 'let witness = enum_variant_missing::StructVariantWillBeRemoved::Bar{...};'