Class: Steep::Subtyping::Check
- Inherits:
-
Object
- Object
- Steep::Subtyping::Check
- Defined in:
- lib/steep/subtyping/check.rb
Instance Attribute Summary collapse
-
#cache ⇒ Object
readonly
Returns the value of attribute cache.
-
#factory ⇒ Object
readonly
Returns the value of attribute factory.
Instance Method Summary collapse
- #alias?(type) ⇒ Boolean
- #cacheable?(relation) ⇒ Boolean
- #check(relation, constraints:, self_type:, assumption: Set.new, trace: Trace.new) ⇒ Object
- #check0(relation, self_type:, assumption:, trace:, constraints:) ⇒ Object
- #check_block_given(name, sub_block, super_block, trace:, constraints:) ⇒ Object
- #check_block_params(name, sub_block, super_block, self_type:, assumption:, trace:, constraints:) ⇒ Object
- #check_block_return(sub_block, super_block, self_type:, assumption:, trace:, constraints:) ⇒ Object
- #check_generic_method_type(name, sub_type, super_type, self_type:, assumption:, trace:, constraints:) ⇒ Object
- #check_interface(sub_interface, super_interface, self_type:, assumption:, trace:, constraints:) ⇒ Object
- #check_method(name, sub_method, super_method, self_type:, assumption:, trace:, constraints:) ⇒ Object
- #check_method_params(name, sub_params, super_params, self_type:, assumption:, trace:, constraints:) ⇒ Object
- #check_method_type(name, sub_type, super_type, self_type:, assumption:, trace:, constraints:) ⇒ Object
- #expand_alias(type, &block) ⇒ Object
- #extract_nominal_pairs(relation) ⇒ Object
- #failure(error:, trace:) ⇒ Object
-
#initialize(factory:) ⇒ Check
constructor
A new instance of Check.
- #match_method_type(name, sub_type, super_type, trace:) ⇒ Object
- #match_params(name, sub_params, super_params, trace:) ⇒ Object
- #same_type?(relation, assumption:) ⇒ Boolean
- #success(constraints:) ⇒ Object
Constructor Details
#initialize(factory:) ⇒ Check
Returns a new instance of Check.
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# File 'lib/steep/subtyping/check.rb', line 7 def initialize(factory:) @factory = factory @cache = {} end |
Instance Attribute Details
#cache ⇒ Object (readonly)
Returns the value of attribute cache.
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# File 'lib/steep/subtyping/check.rb', line 5 def cache @cache end |
#factory ⇒ Object (readonly)
Returns the value of attribute factory.
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# File 'lib/steep/subtyping/check.rb', line 4 def factory @factory end |
Instance Method Details
#alias?(type) ⇒ Boolean
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# File 'lib/steep/subtyping/check.rb', line 40 def alias?(type) type.is_a?(AST::Types::Name::Alias) end |
#cacheable?(relation) ⇒ Boolean
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# File 'lib/steep/subtyping/check.rb', line 44 def cacheable?(relation) relation.sub_type.free_variables.empty? && relation.super_type.free_variables.empty? end |
#check(relation, constraints:, self_type:, assumption: Set.new, trace: Trace.new) ⇒ Object
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# File 'lib/steep/subtyping/check.rb', line 12 def check(relation, constraints:, self_type:, assumption: Set.new, trace: Trace.new) Steep.logger.tagged "#{relation.sub_type} <: #{relation.super_type}" do prefix = trace.size cached = cache[[relation, self_type]] if cached && constraints.empty? if cached.success? cached else cached.merge_trace(trace) end else if assumption.member?(relation) success(constraints: constraints) else assumption = assumption + Set[relation] check0(relation, self_type: self_type, assumption: assumption, trace: trace, constraints: constraints).tap do |result| result = result.else do |failure| failure.drop(prefix) end Steep.logger.debug "result=#{result.class}" cache[[relation, self_type]] = result if cacheable?(relation) end end end end end |
#check0(relation, self_type:, assumption:, trace:, constraints:) ⇒ Object
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# File 'lib/steep/subtyping/check.rb', line 56 def check0(relation, self_type:, assumption:, trace:, constraints:) # puts relation trace.type(relation.sub_type, relation.super_type) do case when same_type?(relation, assumption: assumption) success(constraints: constraints) when relation.sub_type.is_a?(AST::Types::Any) || relation.super_type.is_a?(AST::Types::Any) success(constraints: constraints) when relation.super_type.is_a?(AST::Types::Void) success(constraints: constraints) when relation.super_type.is_a?(AST::Types::Top) success(constraints: constraints) when relation.sub_type.is_a?(AST::Types::Bot) success(constraints: constraints) when relation.super_type.is_a?(AST::Types::Boolean) success(constraints: constraints) when relation.sub_type.is_a?(AST::Types::Self) && !self_type.is_a?(AST::Types::Self) check( Relation.new(sub_type: self_type, super_type: relation.super_type), self_type: self_type, assumption: assumption, trace: trace, constraints: constraints ) when alias?(relation.sub_type) check( Relation.new(sub_type: (relation.sub_type), super_type: relation.super_type), self_type: self_type, assumption: assumption, trace: trace, constraints: constraints ) when alias?(relation.super_type) check( Relation.new(super_type: (relation.super_type), sub_type: relation.sub_type), self_type: self_type, assumption: assumption, trace: trace, constraints: constraints ) when relation.sub_type.is_a?(AST::Types::Literal) check( Relation.new(sub_type: relation.sub_type.back_type, super_type: relation.super_type), self_type: self_type, assumption: assumption, trace: trace, constraints: constraints ) when relation.sub_type.is_a?(AST::Types::Union) results = relation.sub_type.types.map do |sub_type| check(Relation.new(sub_type: sub_type, super_type: relation.super_type), self_type: self_type, assumption: assumption, trace: trace, constraints: constraints) end if results.all?(&:success?) results.first else results.find(&:failure?) end when relation.super_type.is_a?(AST::Types::Union) results = relation.super_type.types.map do |super_type| check(Relation.new(sub_type: relation.sub_type, super_type: super_type), self_type: self_type, assumption: assumption, trace: trace, constraints: constraints) end results.find(&:success?) || results.first when relation.sub_type.is_a?(AST::Types::Intersection) results = relation.sub_type.types.map do |sub_type| check(Relation.new(sub_type: sub_type, super_type: relation.super_type), self_type: self_type, assumption: assumption, trace: trace, constraints: constraints) end results.find(&:success?) || results.first when relation.super_type.is_a?(AST::Types::Intersection) results = relation.super_type.types.map do |super_type| check(Relation.new(sub_type: relation.sub_type, super_type: super_type), self_type: self_type, assumption: assumption, trace: trace, constraints: constraints) end if results.all?(&:success?) results.first else results.find(&:failure?) end when relation.super_type.is_a?(AST::Types::Var) && constraints.unknown?(relation.super_type.name) constraints.add(relation.super_type.name, sub_type: relation.sub_type) success(constraints: constraints) when relation.sub_type.is_a?(AST::Types::Var) && constraints.unknown?(relation.sub_type.name) constraints.add(relation.sub_type.name, super_type: relation.super_type) success(constraints: constraints) when relation.super_type.is_a?(AST::Types::Var) || relation.sub_type.is_a?(AST::Types::Var) failure(error: Result::Failure::UnknownPairError.new(relation: relation), trace: trace) when relation.sub_type.is_a?(AST::Types::Name::Base) && relation.super_type.is_a?(AST::Types::Name::Base) if (pairs = extract_nominal_pairs(relation)) results = pairs.flat_map do |(sub, sup)| Relation.new(sub_type: sub, super_type: sup).yield_self do |rel| [rel, rel.flip] end end.map do |relation| check(relation, self_type: self_type, assumption: assumption, trace: trace, constraints: constraints) end if results.all?(&:success?) results.first else results.find(&:failure?) end else sub_interface = factory.interface(relation.sub_type, private: false) super_interface = factory.interface(relation.super_type, private: false) check_interface(sub_interface, super_interface, self_type: self_type, assumption: assumption, trace: trace, constraints: constraints) end when relation.sub_type.is_a?(AST::Types::Proc) && relation.super_type.is_a?(AST::Types::Proc) check_method_params(:__proc__, relation.sub_type.params, relation.super_type.params, self_type: self_type, assumption: assumption, trace: trace, constraints: constraints).then do check(Relation.new(sub_type: relation.sub_type.return_type, super_type: relation.super_type.return_type), self_type: self_type, assumption: assumption, trace: trace, constraints: constraints) end when relation.sub_type.is_a?(AST::Types::Tuple) && relation.super_type.is_a?(AST::Types::Tuple) if relation.sub_type.types.size >= relation.super_type.types.size pairs = relation.sub_type.types.take(relation.super_type.types.size).zip(relation.super_type.types) results = pairs.flat_map do |t1, t2| relation = Relation.new(sub_type: t1, super_type: t2) [check(relation, self_type: self_type, assumption: assumption, trace: trace, constraints: constraints), check(relation.flip, self_type: self_type, assumption: assumption, trace: trace, constraints: constraints)] end if results.all?(&:success?) success(constraints: constraints) else results.find(&:failure?) end else failure(error: Result::Failure::UnknownPairError.new(relation: relation), trace: trace) end when relation.sub_type.is_a?(AST::Types::Tuple) && relation.super_type.is_a?(AST::Types::Name::Base) tuple_interface = factory.interface(relation.sub_type, private: false) type_interface = factory.interface(relation.super_type, private: false) check_interface(tuple_interface, type_interface, self_type: self_type, assumption: assumption, trace: trace, constraints: constraints) when relation.sub_type.is_a?(AST::Types::Record) && relation.super_type.is_a?(AST::Types::Record) if Set.new(relation.sub_type.elements.keys).superset?(Set.new(relation.super_type.elements.keys)) keys = relation.super_type.elements.keys type_pairs = keys.map {|key| [relation.sub_type.elements[key], relation.super_type.elements[key]] } results = type_pairs.flat_map do |t1, t2| relation = Relation.new(sub_type: t1, super_type: t2) [check(relation, self_type: self_type, assumption: assumption, trace: trace, constraints: constraints), check(relation.flip, self_type: self_type, assumption: assumption, trace: trace, constraints: constraints)] end if results.all?(&:success?) success(constraints: constraints) else results.find(&:failure?) end else failure(error: Result::Failure::UnknownPairError.new(relation: relation), trace: trace) end when relation.sub_type.is_a?(AST::Types::Record) && relation.super_type.is_a?(AST::Types::Name::Base) record_interface = factory.interface(relation.sub_type, private: false) type_interface = factory.interface(relation.super_type, private: false) check_interface(record_interface, type_interface, self_type: self_type, assumption: assumption, trace: trace, constraints: constraints) else failure(error: Result::Failure::UnknownPairError.new(relation: relation), trace: trace) end end end |
#check_block_given(name, sub_block, super_block, trace:, constraints:) ⇒ Object
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# File 'lib/steep/subtyping/check.rb', line 524 def check_block_given(name, sub_block, super_block, trace:, constraints:) case when !super_block && !sub_block success(constraints: constraints) when super_block && sub_block && super_block.optional? == sub_block.optional? success(constraints: constraints) when sub_block&.optional? success(constraints: constraints) else failure( error: Result::Failure::BlockMismatchError.new(name: name), trace: trace ) end end |
#check_block_params(name, sub_block, super_block, self_type:, assumption:, trace:, constraints:) ⇒ Object
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# File 'lib/steep/subtyping/check.rb', line 676 def check_block_params(name, sub_block, super_block, self_type:, assumption:, trace:, constraints:) if sub_block && super_block check_method_params(name, super_block.type.params, sub_block.type.params, self_type: self_type, assumption: assumption, trace: trace, constraints: constraints) else success(constraints: constraints) end end |
#check_block_return(sub_block, super_block, self_type:, assumption:, trace:, constraints:) ⇒ Object
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# File 'lib/steep/subtyping/check.rb', line 690 def check_block_return(sub_block, super_block, self_type:, assumption:, trace:, constraints:) if sub_block && super_block relation = Relation.new(sub_type: super_block.type.return_type, super_type: sub_block.type.return_type) check(relation, self_type: self_type, assumption: assumption, trace: trace, constraints: constraints) else success(constraints: constraints) end end |
#check_generic_method_type(name, sub_type, super_type, self_type:, assumption:, trace:, constraints:) ⇒ Object
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# File 'lib/steep/subtyping/check.rb', line 394 def check_generic_method_type(name, sub_type, super_type, self_type:, assumption:, trace:, constraints:) trace.method_type name, sub_type, super_type do case when sub_type.type_params.empty? && super_type.type_params.empty? check_method_type name, sub_type, super_type, self_type: self_type, assumption: assumption, trace: trace, constraints: constraints when !sub_type.type_params.empty? && super_type.type_params.empty? # Check if super_type is an instance of sub_type. yield_self do sub_args = sub_type.type_params.map {|x| AST::Types::Var.fresh(x) } sub_type = sub_type.instantiate(Interface::Substitution.build(sub_type.type_params, sub_args)) constraints.add_var(*sub_args) match_method_type(name, sub_type, super_type, trace: trace).yield_self do |pairs| case pairs when Array subst = pairs.each.with_object(Interface::Substitution.empty) do |(sub, sup), subst| case when sub.is_a?(AST::Types::Var) && sub_args.include?(sub) if subst.key?(sub.name) && subst[sub.name] != sup return failure(error: Result::Failure::PolyMethodSubtyping.new(name: name), trace: trace) else subst.add!(sub.name, sup) end when sup.is_a?(AST::Types::Var) && sub_args.include?(sup) if subst.key?(sup.name) && subst[sup.name] != sub return failure(error: Result::Failure::PolyMethodSubtyping.new(name: name), trace: trace) else subst.add!(sup.name, sub) end end end check_method_type(name, sub_type.subst(subst), super_type, self_type: self_type, assumption: assumption, trace: trace, constraints: constraints) else pairs end end end when sub_type.type_params.empty? && !super_type.type_params.empty? # Check if sub_type is an instance of super_type && no constraints on type variables (any). yield_self do sub_args = sub_type.type_params.map {|x| AST::Types::Var.fresh(x) } sub_type = sub_type.instantiate(Interface::Substitution.build(sub_type.type_params, sub_args)) constraints.add_var(*sub_args) match_method_type(name, sub_type, super_type, trace: trace).yield_self do |pairs| case pairs when Array result = check_method_type(name, sub_type, super_type, self_type: self_type, assumption: assumption, trace: trace, constraints: constraints) if result.success? && sub_args.map(&:name).none? {|var| constraints.has_constraint?(var) } result else failure(error: Result::Failure::PolyMethodSubtyping.new(name: name), trace: trace) end else pairs end end end when super_type.type_params.size == sub_type.type_params.size # Check if they have the same shape yield_self do args = sub_type.type_params.map {|x| AST::Types::Var.fresh(x) } sub_type_ = sub_type.instantiate(Interface::Substitution.build(sub_type.type_params, args)) super_type_ = super_type.instantiate(Interface::Substitution.build(super_type.type_params, args)) constraints.add_var(*args) check_method_type(name, sub_type_, super_type_, self_type: self_type, assumption: assumption, trace: trace, constraints: constraints) end else # Or error failure(error: Result::Failure::PolyMethodSubtyping.new(name: name), trace: trace) end end end |
#check_interface(sub_interface, super_interface, self_type:, assumption:, trace:, constraints:) ⇒ Object
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# File 'lib/steep/subtyping/check.rb', line 335 def check_interface(sub_interface, super_interface, self_type:, assumption:, trace:, constraints:) trace.interface sub_interface, super_interface do method_triples = [] super_interface.methods.each do |name, sup_method| sub_method = sub_interface.methods[name] if sub_method method_triples << [name, sub_method, sup_method] else return failure(error: Result::Failure::MethodMissingError.new(name: name), trace: trace) end end method_triples.each do |(method_name, sub_method, sup_method)| result = check_method(method_name, sub_method, sup_method, self_type: self_type, assumption: assumption, trace: trace, constraints: constraints) return result if result.failure? end success(constraints: constraints) end end |
#check_method(name, sub_method, super_method, self_type:, assumption:, trace:, constraints:) ⇒ Object
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# File 'lib/steep/subtyping/check.rb', line 365 def check_method(name, sub_method, super_method, self_type:, assumption:, trace:, constraints:) trace.method name, sub_method, super_method do case when sub_method.overload? && super_method.overload? super_method.types.map do |super_type| sub_method.types.map do |sub_type| check_generic_method_type name, sub_type, super_type, self_type: self_type, assumption: assumption, trace: trace, constraints: constraints end.yield_self do |results| results.find(&:success?) || results[0] end end.yield_self do |results| if results.all?(&:success?) || sub_method.incompatible? success constraints: constraints else results.select(&:failure?).last end end else raise "aaaaaaaaaaaaaa" end end end |
#check_method_params(name, sub_params, super_params, self_type:, assumption:, trace:, constraints:) ⇒ Object
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# File 'lib/steep/subtyping/check.rb', line 540 def check_method_params(name, sub_params, super_params, self_type:, assumption:, trace:, constraints:) match_params(name, sub_params, super_params, trace: trace).yield_self do |pairs| case pairs when Array pairs.each do |(sub_type, super_type)| relation = Relation.new(super_type: sub_type, sub_type: super_type) result = check(relation, self_type: self_type, assumption: assumption, trace: trace, constraints: constraints) return result if result.failure? end success(constraints: constraints) else pairs end end end |
#check_method_type(name, sub_type, super_type, self_type:, assumption:, trace:, constraints:) ⇒ Object
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# File 'lib/steep/subtyping/check.rb', line 508 def check_method_type(name, sub_type, super_type, self_type:, assumption:, trace:, constraints:) Steep.logger.tagged("#{name}: #{sub_type} <: #{super_type}") do check_method_params(name, sub_type.params, super_type.params, self_type: self_type, assumption: assumption, trace: trace, constraints: constraints).then do check_block_given(name, sub_type.block, super_type.block, trace: trace, constraints: constraints).then do check_block_params(name, sub_type.block, super_type.block, self_type: self_type, assumption: assumption, trace: trace, constraints: constraints).then do check_block_return(sub_type.block, super_type.block, self_type: self_type, assumption: assumption, trace: trace, constraints:constraints).then do relation = Relation.new(super_type: super_type.return_type, sub_type: sub_type.return_type) check(relation, self_type: self_type, assumption: assumption, trace: trace, constraints: constraints) end end end end end end |
#expand_alias(type, &block) ⇒ Object
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# File 'lib/steep/subtyping/check.rb', line 700 def (type, &block) factory.(type, &block) end |
#extract_nominal_pairs(relation) ⇒ Object
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# File 'lib/steep/subtyping/check.rb', line 286 def extract_nominal_pairs(relation) sub_type = relation.sub_type super_type = relation.super_type case when sub_type.is_a?(AST::Types::Name::Instance) && super_type.is_a?(AST::Types::Name::Instance) if sub_type.name == super_type.name && sub_type.args.size == super_type.args.size sub_type.args.zip(super_type.args) end when sub_type.is_a?(AST::Types::Name::Interface) && super_type.is_a?(AST::Types::Name::Interface) if sub_type.name == super_type.name && sub_type.args.size == super_type.args.size sub_type.args.zip(super_type.args) end when sub_type.is_a?(AST::Types::Name::Alias) && super_type.is_a?(AST::Types::Name::Alias) if sub_type.name == super_type.name && sub_type.args.size == super_type.args.size sub_type.args.zip(super_type.args) end when sub_type.is_a?(AST::Types::Name::Class) && super_type.is_a?(AST::Types::Name::Class) if sub_type.name == super_type.name [] end when sub_type.is_a?(AST::Types::Name::Module) && super_type.is_a?(AST::Types::Name::Module) if sub_type.name == super_type.name [] end end end |
#failure(error:, trace:) ⇒ Object
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# File 'lib/steep/subtyping/check.rb', line 52 def failure(error:, trace:) Result::Failure.new(error: error, trace: trace) end |
#match_method_type(name, sub_type, super_type, trace:) ⇒ Object
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# File 'lib/steep/subtyping/check.rb', line 558 def match_method_type(name, sub_type, super_type, trace:) [].tap do |pairs| match_params(name, sub_type.params, super_type.params, trace: trace).yield_self do |result| return result unless result.is_a?(Array) pairs.push(*result) pairs.push [sub_type.return_type, super_type.return_type] case when !super_type.block && !sub_type.block # No block required and given when super_type.block && sub_type.block match_params(name, super_type.block.type.params, sub_type.block.type.params, trace: trace).yield_self do |block_result| return block_result unless block_result.is_a?(Array) pairs.push(*block_result) pairs.push [super_type.block.type.return_type, sub_type.block.type.return_type] end else return failure(error: Result::Failure::BlockMismatchError.new(name: name), trace: trace) end end end end |
#match_params(name, sub_params, super_params, trace:) ⇒ Object
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# File 'lib/steep/subtyping/check.rb', line 584 def match_params(name, sub_params, super_params, trace:) pairs = [] sub_flat = sub_params.flat_unnamed_params sup_flat = super_params.flat_unnamed_params failure = failure(error: Result::Failure::ParameterMismatchError.new(name: name), trace: trace) case when super_params.rest return failure unless sub_params.rest while sub_flat.size > 0 sub_type = sub_flat.shift sup_type = sup_flat.shift if sup_type pairs << [sub_type.last, sup_type.last] else pairs << [sub_type.last, super_params.rest] end end if sub_params.rest pairs << [sub_params.rest, super_params.rest] end when sub_params.rest while sub_flat.size > 0 sub_type = sub_flat.shift sup_type = sup_flat.shift if sup_type pairs << [sub_type.last, sup_type.last] else break end end if sub_params.rest && !sup_flat.empty? sup_flat.each do |sup_type| pairs << [sub_params.rest, sup_type.last] end end when sub_params.required.size + sub_params.optional.size >= super_params.required.size + super_params.optional.size while sub_flat.size > 0 sub_type = sub_flat.shift sup_type = sup_flat.shift if sup_type pairs << [sub_type.last, sup_type.last] else if sub_type.first == :required return failure else break end end end else return failure end sub_flat_kws = sub_params.flat_keywords sup_flat_kws = super_params.flat_keywords sup_flat_kws.each do |name, _| if sub_flat_kws.key?(name) pairs << [sub_flat_kws[name], sup_flat_kws[name]] else if sub_params.rest_keywords pairs << [sub_params.rest_keywords, sup_flat_kws[name]] else return failure end end end sub_params.required_keywords.each do |name, _| unless super_params.required_keywords.key?(name) return failure end end if sub_params.rest_keywords && super_params.rest_keywords pairs << [sub_params.rest_keywords, super_params.rest_keywords] end pairs end |
#same_type?(relation, assumption:) ⇒ Boolean
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# File 'lib/steep/subtyping/check.rb', line 314 def same_type?(relation, assumption:) if assumption.include?(relation) && assumption.include?(relation.flip) return true end case when relation.sub_type == relation.super_type true when relation.sub_type.is_a?(AST::Types::Name::Base) && relation.super_type.is_a?(AST::Types::Name::Base) if (pairs = extract_nominal_pairs(relation)) pairs.all? do |(s, t)| same_type?(Relation.new(sub_type: s, super_type: t), assumption: assumption) end else false end else false end end |