diff options
Diffstat (limited to 'syn/tests/test_generics.rs')
| -rw-r--r-- | syn/tests/test_generics.rs | 285 |
1 files changed, 0 insertions, 285 deletions
diff --git a/syn/tests/test_generics.rs b/syn/tests/test_generics.rs deleted file mode 100644 index e863b77..0000000 --- a/syn/tests/test_generics.rs +++ /dev/null @@ -1,285 +0,0 @@ -mod features; - -#[macro_use] -mod macros; - -use quote::quote; -use syn::{DeriveInput, ItemFn, TypeParamBound, WhereClause, WherePredicate}; - -#[test] -fn test_split_for_impl() { - let input = quote! { - struct S<'a, 'b: 'a, #[may_dangle] T: 'a = ()> where T: Debug; - }; - - snapshot!(input as DeriveInput, @r###" - DeriveInput { - vis: Inherited, - ident: "S", - generics: Generics { - lt_token: Some, - params: [ - Lifetime(LifetimeDef { - lifetime: Lifetime { - ident: "a", - }, - }), - Lifetime(LifetimeDef { - lifetime: Lifetime { - ident: "b", - }, - colon_token: Some, - bounds: [ - Lifetime { - ident: "a", - }, - ], - }), - Type(TypeParam { - attrs: [ - Attribute { - style: Outer, - path: Path { - segments: [ - PathSegment { - ident: "may_dangle", - arguments: None, - }, - ], - }, - tokens: ``, - }, - ], - ident: "T", - colon_token: Some, - bounds: [ - Lifetime(Lifetime { - ident: "a", - }), - ], - eq_token: Some, - default: Some(Type::Tuple), - }), - ], - gt_token: Some, - where_clause: Some(WhereClause { - predicates: [ - Type(PredicateType { - bounded_ty: Type::Path { - path: Path { - segments: [ - PathSegment { - ident: "T", - arguments: None, - }, - ], - }, - }, - bounds: [ - Trait(TraitBound { - modifier: None, - path: Path { - segments: [ - PathSegment { - ident: "Debug", - arguments: None, - }, - ], - }, - }), - ], - }), - ], - }), - }, - data: Data::Struct { - fields: Unit, - semi_token: Some, - }, - } - "###); - - let generics = input.generics; - let (impl_generics, ty_generics, where_clause) = generics.split_for_impl(); - - let generated = quote! { - impl #impl_generics MyTrait for Test #ty_generics #where_clause {} - }; - let expected = quote! { - impl<'a, 'b: 'a, #[may_dangle] T: 'a> MyTrait - for Test<'a, 'b, T> - where - T: Debug - {} - }; - assert_eq!(generated.to_string(), expected.to_string()); - - let turbofish = ty_generics.as_turbofish(); - let generated = quote! { - Test #turbofish - }; - let expected = quote! { - Test::<'a, 'b, T> - }; - assert_eq!(generated.to_string(), expected.to_string()); -} - -#[test] -fn test_ty_param_bound() { - let tokens = quote!('a); - snapshot!(tokens as TypeParamBound, @r###" - Lifetime(Lifetime { - ident: "a", - }) - "###); - - let tokens = quote!('_); - snapshot!(tokens as TypeParamBound, @r###" - Lifetime(Lifetime { - ident: "_", - }) - "###); - - let tokens = quote!(Debug); - snapshot!(tokens as TypeParamBound, @r###" - Trait(TraitBound { - modifier: None, - path: Path { - segments: [ - PathSegment { - ident: "Debug", - arguments: None, - }, - ], - }, - }) - "###); - - let tokens = quote!(?Sized); - snapshot!(tokens as TypeParamBound, @r###" - Trait(TraitBound { - modifier: Maybe, - path: Path { - segments: [ - PathSegment { - ident: "Sized", - arguments: None, - }, - ], - }, - }) - "###); -} - -#[test] -fn test_fn_precedence_in_where_clause() { - // This should parse as two separate bounds, `FnOnce() -> i32` and `Send` - not - // `FnOnce() -> (i32 + Send)`. - let input = quote! { - fn f<G>() - where - G: FnOnce() -> i32 + Send, - { - } - }; - - snapshot!(input as ItemFn, @r###" - ItemFn { - vis: Inherited, - sig: Signature { - ident: "f", - generics: Generics { - lt_token: Some, - params: [ - Type(TypeParam { - ident: "G", - }), - ], - gt_token: Some, - where_clause: Some(WhereClause { - predicates: [ - Type(PredicateType { - bounded_ty: Type::Path { - path: Path { - segments: [ - PathSegment { - ident: "G", - arguments: None, - }, - ], - }, - }, - bounds: [ - Trait(TraitBound { - modifier: None, - path: Path { - segments: [ - PathSegment { - ident: "FnOnce", - arguments: PathArguments::Parenthesized { - output: Type( - Type::Path { - path: Path { - segments: [ - PathSegment { - ident: "i32", - arguments: None, - }, - ], - }, - }, - ), - }, - }, - ], - }, - }), - Trait(TraitBound { - modifier: None, - path: Path { - segments: [ - PathSegment { - ident: "Send", - arguments: None, - }, - ], - }, - }), - ], - }), - ], - }), - }, - output: Default, - }, - block: Block, - } - "###); - - let where_clause = input.sig.generics.where_clause.as_ref().unwrap(); - assert_eq!(where_clause.predicates.len(), 1); - - let predicate = match &where_clause.predicates[0] { - WherePredicate::Type(pred) => pred, - _ => panic!("wrong predicate kind"), - }; - - assert_eq!(predicate.bounds.len(), 2, "{:#?}", predicate.bounds); - - let first_bound = &predicate.bounds[0]; - assert_eq!(quote!(#first_bound).to_string(), "FnOnce ( ) -> i32"); - - let second_bound = &predicate.bounds[1]; - assert_eq!(quote!(#second_bound).to_string(), "Send"); -} - -#[test] -fn test_where_clause_at_end_of_input() { - let input = quote! { - where - }; - - snapshot!(input as WhereClause, @"WhereClause"); - - assert_eq!(input.predicates.len(), 0); -} |