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Opening existentials
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| protocol Animal { | |
| func bark() | |
| } | |
| struct Dog: Animal { | |
| func bark() { | |
| print("わんわん") | |
| } | |
| } | |
| let a: Animal = Dog() | |
| a.bark() |
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| (found solution 0 0 0 0 0 0 0 0 0 0 0 0 0) | |
| ---Constraint solving for the expression at [proto.swift:11:17 - line:11:21]--- | |
| (increasing score due to function conversion) | |
| (overload set choice binding ($T1) -> $T0 := () -> Dog) | |
| ---Initial constraints for the given expression--- | |
| (call_expr type='Dog' location=proto.swift:11:17 range=[proto.swift:11:17 - line:11:21] arg_labels= | |
| (type_expr type='Dog.Type' location=proto.swift:11:17 range=[proto.swift:11:17 - line:11:17] typerepr='Dog') | |
| (tuple_expr type='()' location=proto.swift:11:20 range=[proto.swift:11:20 - line:11:21])) | |
| Score: 0 0 0 0 1 0 0 0 0 0 0 0 0 | |
| Contextual Type: Animal at [proto.swift:11:8 - line:11:8] | |
| Type Variables: | |
| #0 = $T0 [inout allowed] as Dog | |
| #1 = $T1 [lvalue allowed] [inout allowed] as () | |
| Active Constraints: | |
| Inactive Constraints: | |
| Resolved overloads: | |
| selected overload set choice Dog.Type.init: ($T1) -> $T0 == () -> Dog | |
| (found solution 0 0 0 0 1 0 0 0 0 0 0 0 0) | |
| ---Solution--- | |
| Fixed score: 0 0 0 0 1 0 0 0 0 0 0 0 0 | |
| Type variables: | |
| $T0 as Dog | |
| $T1 as () | |
| Overload choices: | |
| locator@0x7fdd0c8c8720 [[email protected]:11:17 -> apply function -> constructor member] with proto.(file).Dog.init()@proto.swift:5:8 as Dog.Type.init: () -> Dog | |
| Constraint restrictions: | |
| Dog to Animal is [existential] | |
| Disjunction choices: | |
| Conformances: | |
| At locator@0x7fdd0c8c8690 [[email protected]:11:17] | |
| (normal_conformance type=Dog protocol=Animal | |
| (value req=bark() witness=proto.(file).Dog.bark()@proto.swift:6:8)) | |
| ---Type-checked expression--- | |
| (call_expr type='Dog' location=proto.swift:11:17 range=[proto.swift:11:17 - line:11:21] arg_labels= | |
| (constructor_ref_call_expr type='() -> Dog' location=proto.swift:11:17 range=[proto.swift:11:17 - line:11:17] | |
| (declref_expr implicit type='(Dog.Type) -> () -> Dog' location=proto.swift:11:17 range=[proto.swift:11:17 - line:11:17] decl=proto.(file).Dog.init()@proto.swift:5:8 function_ref=single) | |
| (type_expr type='Dog.Type' location=proto.swift:11:17 range=[proto.swift:11:17 - line:11:17] typerepr='Dog')) | |
| (tuple_expr type='()' location=proto.swift:11:20 range=[proto.swift:11:20 - line:11:21])) | |
| ---Constraint solving for the expression at [proto.swift:7:6 - line:7:26]--- | |
| ---Initial constraints for the given expression--- | |
| (call_expr type='()' location=proto.swift:7:6 range=[proto.swift:7:6 - line:7:26] arg_labels=_: | |
| (overloaded_decl_ref_expr type='$T0' location=proto.swift:7:6 range=[proto.swift:7:6 - line:7:6] name=print #decls=6 function_ref=single | |
| Swift.(file).print(_:separator:terminator:) | |
| Swift.(file).print(_:separator:terminator:to:) | |
| Swift.(file).print(_:separator:terminator:toStream:) | |
| Swift.(file).print(_:appendNewline:) | |
| Swift.(file).print | |
| Swift.(file).print(_:_:appendNewline:)) | |
| (paren_expr type='($T1)' location=proto.swift:7:12 range=[proto.swift:7:11 - line:7:26] | |
| (string_literal_expr type='$T1' location=proto.swift:7:12 range=[proto.swift:7:12 - line:7:12] encoding=utf8 value="わんわん" builtin_initializer=**NULL** initializer=**NULL**))) | |
| Score: 0 0 0 0 0 0 0 0 0 0 0 0 0 | |
| Type Variables: | |
| #0 = $T0 [lvalue allowed] [inout allowed] | |
| #1 = $T1 [inout allowed] | |
| Active Constraints: | |
| Inactive Constraints: | |
| $T1 literal conforms to ExpressibleByStringLiteral [[locator@0x7fdd0d8062b0 [[email protected]:7:12]]]; | |
| ($T1) -> () applicable fn $T0 [[locator@0x7fdd0d806390 [[email protected]:7:6 -> apply function]]]; | |
| disjunction [[locator@0x7fdd0d806000 [[email protected]:7:6]]]:$T0 bound to decl Swift.(file).print(_:separator:terminator:) : (Any..., String, String) -> () [[locator@0x7fdd0d806000 [[email protected]:7:6]]]; or $T0 bound to decl Swift.(file).print(_:separator:terminator:to:) : <Target where Target : TextOutputStream> (Any..., separator: String, terminator: String, to: inout Target) -> () [[locator@0x7fdd0d806000 [[email protected]:7:6]]]; or $T0 bound to decl Swift.(file).print(_:separator:terminator:toStream:) : <Target where Target : TextOutputStream> (Any..., separator: String, terminator: String, toStream: inout Target) -> () [[locator@0x7fdd0d806000 [[email protected]:7:6]]]; or $T0 bound to decl Swift.(file).print(_:appendNewline:) : <T> (T, appendNewline: Bool) -> () [[locator@0x7fdd0d806000 [[email protected]:7:6]]]; or $T0 bound to decl Swift.(file).print : <T> (T, inout TextOutputStream) -> () [[locator@0x7fdd0d806000 [[email protected]:7:6]]]; or $T0 bound to decl Swift.(file).print(_:_:appendNewline:) : <T> (T, inout TextOutputStream, appendNewline: Bool) -> () [[locator@0x7fdd0d806000 [[email protected]:7:6]]]; | |
| ($T1 fully_bound literal=3 involves_type_vars bindings=(subtypes of) (default from ExpressibleByStringLiteral) String) | |
| (assuming $T0 bound to decl Swift.(file).print(_:separator:terminator:) : (Any..., String, String) -> () [[locator@0x7fdd0d806000 [[email protected]:7:6]]]; | |
| (overload set choice binding $T0 := (Any..., String, String) -> ()) | |
| ($T1 literal=3 bindings=(subtypes of) (default from ExpressibleByStringLiteral) String (subtypes of) Any) | |
| Active bindings: $T1 := String $T1 := Any | |
| (trying $T1 := String | |
| (increasing score due to empty-existential conversion) | |
| (found solution 0 0 0 0 0 0 0 0 0 0 1 0 0) | |
| ) | |
| (trying $T1 := Any | |
| (increasing score due to non-default literal) | |
| (solution is worse than the best solution) | |
| ) | |
| ) | |
| ---Solution--- | |
| Fixed score: 0 0 0 0 0 0 0 0 0 0 1 0 0 | |
| Type variables: | |
| $T0 as (Any..., String, String) -> () | |
| $T1 as String | |
| Overload choices: | |
| locator@0x7fdd0d806000 [[email protected]:7:6] with Swift.(file).print(_:separator:terminator:) as print: (Any..., String, String) -> () | |
| Constraint restrictions: | |
| String to Any is [existential] | |
| Disjunction choices: | |
| Conformances: | |
| At locator@0x7fdd0d8062b0 [[email protected]:7:12] | |
| (normal_conformance type=String protocol=ExpressibleByStringLiteral lazy | |
| (normal_conformance type=String protocol=ExpressibleByExtendedGraphemeClusterLiteral lazy | |
| (normal_conformance type=String protocol=ExpressibleByUnicodeScalarLiteral lazy | |
| (normal_conformance type=String protocol=_ExpressibleByBuiltinUnicodeScalarLiteral lazy)) | |
| (normal_conformance type=String protocol=_ExpressibleByBuiltinExtendedGraphemeClusterLiteral lazy | |
| (normal_conformance type=String protocol=_ExpressibleByBuiltinUnicodeScalarLiteral | |
| (value req=init(_builtinUnicodeScalarLiteral:) witness=Swift.(file).String.init(_builtinUnicodeScalarLiteral:))))) | |
| (normal_conformance type=String protocol=_ExpressibleByBuiltinStringLiteral lazy | |
| (normal_conformance type=String protocol=_ExpressibleByBuiltinExtendedGraphemeClusterLiteral | |
| (value req=init(_builtinExtendedGraphemeClusterLiteral:utf8CodeUnitCount:isASCII:) witness=Swift.(file).String.init(_builtinExtendedGraphemeClusterLiteral:utf8CodeUnitCount:isASCII:)) | |
| (normal_conformance type=String protocol=_ExpressibleByBuiltinUnicodeScalarLiteral | |
| (value req=init(_builtinUnicodeScalarLiteral:) witness=Swift.(file).String.init(_builtinUnicodeScalarLiteral:)))))) | |
| ---Constraint solving for the expression at [proto.swift:7:12 - line:7:12]--- | |
| (overload set choice binding $T0 := (RawPointer, Word) -> String) | |
| ---Initial constraints for the given expression--- | |
| (unresolved_dot_expr implicit type='(RawPointer, Word) -> String' location=proto.swift:7:12 range=[proto.swift:7:12 - line:7:12] field 'init(_builtinUTF16StringLiteral:utf16CodeUnitCount:)' function_ref=unapplied | |
| (type_expr implicit type='String.Type' location=proto.swift:7:12 range=[proto.swift:7:12 - line:7:12] typerepr='String')) | |
| Score: 0 0 0 0 0 0 0 0 0 0 0 0 0 | |
| Type Variables: | |
| #0 = $T0 [lvalue allowed] [inout allowed] as (RawPointer, Word) -> String | |
| Active Constraints: | |
| Inactive Constraints: | |
| Resolved overloads: | |
| selected overload set choice String.Type.init: $T0 == (RawPointer, Word) -> String | |
| (found solution 0 0 0 0 0 0 0 0 0 0 0 0 0) | |
| ---Solution--- | |
| Fixed score: 0 0 0 0 0 0 0 0 0 0 0 0 0 | |
| Type variables: | |
| $T0 as (RawPointer, Word) -> String | |
| Overload choices: | |
| locator@0x7fdd0d86f218 [[email protected]:7:12 -> member] with Swift.(file).String.init(_builtinUTF16StringLiteral:utf16CodeUnitCount:) as String.Type.init: (RawPointer, Word) -> String | |
| Constraint restrictions: | |
| Disjunction choices: | |
| ---Type-checked expression--- | |
| (constructor_ref_call_expr implicit type='(RawPointer, Word) -> String' location=proto.swift:7:12 range=[proto.swift:7:12 - line:7:12] | |
| (declref_expr implicit type='(String.Type) -> (RawPointer, Word) -> String' location=proto.swift:7:12 range=[proto.swift:7:12 - line:7:12] decl=Swift.(file).String.init(_builtinUTF16StringLiteral:utf16CodeUnitCount:) function_ref=unapplied) | |
| (type_expr implicit type='String.Type' location=proto.swift:7:12 range=[proto.swift:7:12 - line:7:12] typerepr='String')) | |
| ---Type-checked expression--- | |
| (call_expr type='()' location=proto.swift:7:6 range=[proto.swift:7:6 - line:7:26] arg_labels=_: | |
| (declref_expr type='(Any..., String, String) -> ()' location=proto.swift:7:6 range=[proto.swift:7:6 - line:7:6] decl=Swift.(file).print(_:separator:terminator:) function_ref=single) | |
| (tuple_shuffle_expr implicit type='(Any..., separator: String, terminator: String)' location=proto.swift:7:12 range=[proto.swift:7:11 - line:7:26] source_is_scalar elements=[-2, -1, -1] variadic_sources=[0] default_args_owner=Swift.(file).print(_:separator:terminator:) | |
| (paren_expr type='Any' location=proto.swift:7:12 range=[proto.swift:7:11 - line:7:26] | |
| (erasure_expr implicit type='Any' location=proto.swift:7:12 range=[proto.swift:7:12 - line:7:12] | |
| (string_literal_expr type='String' location=proto.swift:7:12 range=[proto.swift:7:12 - line:7:12] encoding=utf16 value="わんわん" builtin_initializer=Swift.(file).String.init(_builtinUTF16StringLiteral:utf16CodeUnitCount:) initializer=**NULL**))))) | |
| ---Constraint solving for the expression at [proto.swift:13:1 - line:13:8]--- | |
| (overload set choice binding $T0 := Animal) | |
| (overload set choice binding $T1 := () -> ()) | |
| ---Initial constraints for the given expression--- | |
| (call_expr type='()' location=proto.swift:13:3 range=[proto.swift:13:1 - line:13:8] arg_labels= | |
| (unresolved_dot_expr type='() -> ()' location=proto.swift:13:3 range=[proto.swift:13:1 - line:13:3] field 'bark' function_ref=single | |
| (declref_expr type='Animal' location=proto.swift:13:1 range=[proto.swift:13:1 - line:13:1] decl=proto.(file)[email protected]:11:5 direct_to_storage function_ref=unapplied)) | |
| (tuple_expr type='()' location=proto.swift:13:7 range=[proto.swift:13:7 - line:13:8])) | |
| Score: 0 0 0 0 0 0 0 0 0 0 0 0 0 | |
| Type Variables: | |
| #0 = $T0 [lvalue allowed] [inout allowed] as Animal | |
| #1 = $T1 [lvalue allowed] [inout allowed] as () -> () | |
| #2 = $T2 as Animal | |
| #3 = $T3 [inout allowed] as () | |
| Active Constraints: | |
| Inactive Constraints: | |
| Resolved overloads: | |
| selected overload set choice Animal.bark: $T1 == () -> () | |
| selected overload set choice a: $T0 == Animal | |
| Opened types: | |
| locator@0x7fdd0f000ea8 [[email protected]:13:3 -> member] opens τ_0_0 -> $T2 | |
| Opened existential types: | |
| locator@0x7fdd0f000ea8 [[email protected]:13:3 -> member] opens to Animal | |
| (found solution 0 0 0 0 0 0 0 0 0 0 0 0 0) | |
| ---Solution--- | |
| Fixed score: 0 0 0 0 0 0 0 0 0 0 0 0 0 | |
| Type variables: | |
| $T3 as () | |
| $T0 as Animal | |
| $T1 as () -> () | |
| $T2 as Animal | |
| Overload choices: | |
| locator@0x7fdd0f000ea8 [[email protected]:13:3 -> member] with proto.(file).Animal.bark()@proto.swift:2:8 as Animal.bark: () -> () | |
| locator@0x7fdd0f000e18 [[email protected]:13:1] with proto.(file)[email protected]:11:5 as a: Animal | |
| Constraint restrictions: | |
| Disjunction choices: | |
| Opened types: | |
| locator@0x7fdd0f000ea8 [[email protected]:13:3 -> member] opens τ_0_0 -> $T2 | |
| Opened existential types: | |
| locator@0x7fdd0f000ea8 [[email protected]:13:3 -> member] opens to Animal | |
| ---Type-checked expression--- | |
| (open_existential_expr implicit type='()' location=proto.swift:13:3 range=[proto.swift:13:1 - line:13:8] | |
| (opaque_value_expr implicit type='Animal' location=proto.swift:13:1 range=[proto.swift:13:1 - line:13:1] @ 0x7fdd0d933960) | |
| (declref_expr type='Animal' location=proto.swift:13:1 range=[proto.swift:13:1 - line:13:1] decl=proto.(file)[email protected]:11:5 direct_to_storage function_ref=unapplied) | |
| (call_expr type='()' location=proto.swift:13:3 range=[proto.swift:13:1 - line:13:8] arg_labels= | |
| (dot_syntax_call_expr type='() -> ()' location=proto.swift:13:3 range=[proto.swift:13:1 - line:13:3] | |
| (declref_expr type='(Animal) -> () -> ()' location=proto.swift:13:3 range=[proto.swift:13:3 - line:13:3] decl=proto.(file).Animal.bark()@proto.swift:2:8 [with Animal[abstract:Animal]] function_ref=single) | |
| (opaque_value_expr implicit type='Animal' location=proto.swift:13:1 range=[proto.swift:13:1 - line:13:1] @ 0x7fdd0d933960)) | |
| (tuple_expr type='()' location=proto.swift:13:7 range=[proto.swift:13:7 - line:13:8]))) |
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| (source_file | |
| (protocol "Animal" requirement signature=<null> | |
| (func_decl "bark()" | |
| (parameter_list | |
| (parameter "self")) | |
| (parameter_list))) | |
| (struct_decl "Dog" inherits: <null> | |
| (func_decl "bark()" | |
| (parameter_list | |
| (parameter "self")) | |
| (parameter_list) | |
| (brace_stmt | |
| (call_expr type='<null>' arg_labels=_: | |
| (unresolved_decl_ref_expr type='<null>' name=print function_ref=unapplied) | |
| (paren_expr type='<null>' | |
| (string_literal_expr type='<null>' encoding=utf8 value="わんわん" builtin_initializer=**NULL** initializer=**NULL**)))))) | |
| (top_level_code_decl | |
| (brace_stmt | |
| (pattern_binding_decl | |
| (pattern_typed | |
| (pattern_named 'a') | |
| (type_ident | |
| (component id='Animal' bind=none))) | |
| (call_expr type='<null>' arg_labels= | |
| (unresolved_decl_ref_expr type='<null>' name=Dog function_ref=unapplied) | |
| (tuple_expr type='()' location=proto.swift:11:20 range=[proto.swift:11:20 - line:11:21]))) | |
| )) | |
| (var_decl "a" type='<null type>' let storage_kind=stored) | |
| (top_level_code_decl | |
| (brace_stmt | |
| (call_expr type='<null>' arg_labels= | |
| (unresolved_dot_expr type='<null>' field 'bark' function_ref=unapplied | |
| (unresolved_decl_ref_expr type='<null>' name=a function_ref=unapplied)) | |
| (tuple_expr type='()' location=proto.swift:13:7 range=[proto.swift:13:7 - line:13:8]))))) |
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| (source_file | |
| (protocol "Animal" <Self : Animal> interface type='Animal.Protocol' access=internal @_fixed_layout requirement signature=<Self> | |
| (func_decl "bark()" interface type='<Self where Self : Animal> (Self) -> () -> ()' access=internal | |
| (parameter_list | |
| (parameter "self" type='Self' interface type='Self')) | |
| (parameter_list))) | |
| (struct_decl "Dog" interface type='Dog.Type' access=internal @_fixed_layout inherits: Animal | |
| (func_decl "bark()" interface type='(Dog) -> () -> ()' access=internal | |
| (parameter_list | |
| (parameter "self" type='Dog' interface type='Dog')) | |
| (parameter_list) | |
| (brace_stmt | |
| (call_expr type='()' location=proto.swift:7:6 range=[proto.swift:7:6 - line:7:26] nothrow arg_labels=_: | |
| (declref_expr type='(Any..., String, String) -> ()' location=proto.swift:7:6 range=[proto.swift:7:6 - line:7:6] decl=Swift.(file).print(_:separator:terminator:) function_ref=single) | |
| (tuple_shuffle_expr implicit type='(Any..., separator: String, terminator: String)' location=proto.swift:7:12 range=[proto.swift:7:11 - line:7:26] source_is_scalar elements=[-2, -1, -1] variadic_sources=[0] default_args_owner=Swift.(file).print(_:separator:terminator:) | |
| (paren_expr type='Any' location=proto.swift:7:12 range=[proto.swift:7:11 - line:7:26] | |
| (erasure_expr implicit type='Any' location=proto.swift:7:12 range=[proto.swift:7:12 - line:7:12] | |
| (string_literal_expr type='String' location=proto.swift:7:12 range=[proto.swift:7:12 - line:7:12] encoding=utf16 value="わんわん" builtin_initializer=Swift.(file).String.init(_builtinUTF16StringLiteral:utf16CodeUnitCount:) initializer=**NULL**))))))) | |
| (constructor_decl implicit "init()" interface type='(Dog.Type) -> () -> Dog' access=internal designated | |
| (parameter_list | |
| (parameter "self" type='inout Dog' interface type='inout Dog' mutable)) | |
| (parameter_list) | |
| (brace_stmt | |
| (return_stmt implicit)))) | |
| (top_level_code_decl | |
| (brace_stmt | |
| (pattern_binding_decl | |
| (pattern_typed type='Animal' | |
| (pattern_named type='Animal' 'a') | |
| (type_ident | |
| (component id='Animal' bind=proto.(file)[email protected]:1:10))) | |
| (erasure_expr implicit type='Animal' location=proto.swift:11:17 range=[proto.swift:11:17 - line:11:21] | |
| (normal_conformance type=Dog protocol=Animal | |
| (value req=bark() witness=proto.(file).Dog.bark()@proto.swift:6:8)) | |
| (call_expr type='Dog' location=proto.swift:11:17 range=[proto.swift:11:17 - line:11:21] nothrow arg_labels= | |
| (constructor_ref_call_expr type='() -> Dog' location=proto.swift:11:17 range=[proto.swift:11:17 - line:11:17] nothrow | |
| (declref_expr implicit type='(Dog.Type) -> () -> Dog' location=proto.swift:11:17 range=[proto.swift:11:17 - line:11:17] decl=proto.(file).Dog.init()@proto.swift:5:8 function_ref=single) | |
| (type_expr type='Dog.Type' location=proto.swift:11:17 range=[proto.swift:11:17 - line:11:17] typerepr='Dog')) | |
| (tuple_expr type='()' location=proto.swift:11:20 range=[proto.swift:11:20 - line:11:21])))) | |
| )) | |
| (var_decl "a" type='Animal' interface type='Animal' access=internal let storage_kind=stored) | |
| (top_level_code_decl | |
| (brace_stmt | |
| (open_existential_expr implicit type='()' location=proto.swift:13:3 range=[proto.swift:13:1 - line:13:8] | |
| (opaque_value_expr implicit type='Animal' location=proto.swift:13:1 range=[proto.swift:13:1 - line:13:1] @ 0x7fef860f07b0) | |
| (declref_expr type='Animal' location=proto.swift:13:1 range=[proto.swift:13:1 - line:13:1] decl=proto.(file)[email protected]:11:5 direct_to_storage function_ref=unapplied) | |
| (call_expr type='()' location=proto.swift:13:3 range=[proto.swift:13:1 - line:13:8] nothrow arg_labels= | |
| (dot_syntax_call_expr type='() -> ()' location=proto.swift:13:3 range=[proto.swift:13:1 - line:13:3] nothrow | |
| (declref_expr type='(Animal) -> () -> ()' location=proto.swift:13:3 range=[proto.swift:13:3 - line:13:3] decl=proto.(file).Animal.bark()@proto.swift:2:8 [with Animal[abstract:Animal]] function_ref=single) | |
| (opaque_value_expr implicit type='Animal' location=proto.swift:13:1 range=[proto.swift:13:1 - line:13:1] @ 0x7fef860f07b0)) | |
| (tuple_expr type='()' location=proto.swift:13:7 range=[proto.swift:13:7 - line:13:8])))))) |
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a.bark() の呼び出し部分で
open_existential_exprが確認できる