ctest: add tests for field size, offset, and field ptr

ctest-next/src/ast/field.rs

@@ -3,7 +3,6 @@ use crate::BoxStr;
 /// Represents a field in a struct or union defined in Rust.
 #[derive(Debug, Clone)]
 pub struct Field {
-    #[expect(unused)]
     pub(crate) public: bool,
     pub(crate) ident: BoxStr,
     pub(crate) ty: syn::Type,

ctest-next/src/ast/structure.rs

@@ -5,7 +5,6 @@ use crate::{BoxStr, Field};
 pub struct Struct {
     pub(crate) public: bool,
     pub(crate) ident: BoxStr,
-    #[expect(unused)]
     pub(crate) fields: Vec<Field>,
 }
 

ctest-next/src/ast/union.rs

@@ -6,7 +6,6 @@ pub struct Union {
     #[expect(unused)]
     pub(crate) public: bool,
     pub(crate) ident: BoxStr,
-    #[expect(unused)]
     pub(crate) fields: Vec<Field>,
 }
 

ctest-next/src/generator.rs

@@ -38,9 +38,9 @@ pub struct TestGenerator {
     pub(crate) defines: Vec<(String, Option<String>)>,
     cfg: Vec<(String, Option<String>)>,
     mapped_names: Vec<MappedName>,
-    skips: Vec<Skip>,
+    pub(crate) skips: Vec<Skip>,
     verbose_skip: bool,
-    volatile_items: Vec<VolatileItem>,
+    pub(crate) volatile_items: Vec<VolatileItem>,
     array_arg: Option<ArrayArg>,
     skip_private: bool,
     skip_roundtrip: Option<SkipTest>,
@@ -872,7 +872,6 @@ impl TestGenerator {
         let mut ffi_items = FfiItems::new();
         ffi_items.visit_file(&ast);
 
-        // FIXME(ctest): Does not filter out tests for fields.
         self.filter_ffi_items(&mut ffi_items);
 
         let output_directory = self
@@ -945,7 +944,7 @@ impl TestGenerator {
     }
 
     /// Maps Rust identifiers or types to C counterparts, or defaults to the original name.
-    pub(crate) fn map<'a>(&self, item: impl Into<MapInput<'a>>) -> String {
+    pub(crate) fn rty_to_cty<'a>(&self, item: impl Into<MapInput<'a>>) -> String {
         let item = item.into();
         if let Some(mapped) = self.mapped_names.iter().find_map(|f| f(&item)) {
             return mapped;

ctest-next/src/lib.rs

@@ -56,9 +56,7 @@ pub(crate) enum MapInput<'a> {
     Struct(&'a Struct),
     Union(&'a Union),
     Fn(&'a crate::Fn),
-    #[expect(unused)]
     StructField(&'a Struct, &'a Field),
-    #[expect(unused)]
     UnionField(&'a Union, &'a Field),
     Alias(&'a Type),
     Const(&'a Const),
@@ -67,9 +65,7 @@ pub(crate) enum MapInput<'a> {
     /// This variant is used for renaming the struct type.
     StructType(&'a str),
     UnionType(&'a str),
-    #[expect(unused)]
     StructFieldType(&'a Struct, &'a Field),
-    #[expect(unused)]
     UnionFieldType(&'a Union, &'a Field),
 }