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Name	Size	Permission	Date
annotate	[ DIR ]	drwxr-xr-x	2026-05-05 23:08
cli	[ DIR ]	drwxr-xr-x	2026-05-05 23:08
collection	[ DIR ]	drwxr-xr-x	2026-05-05 23:08
prototype	[ DIR ]	drwxr-xr-x	2026-05-05 23:08
rdoc	[ DIR ]	drwxr-xr-x	2026-05-05 23:08
resolver	[ DIR ]	drwxr-xr-x	2026-05-05 23:08
shims	[ DIR ]	drwxr-xr-x	2026-05-05 23:08
test	[ DIR ]	drwxr-xr-x	2026-05-05 23:08
unit_test	[ DIR ]	drwxr-xr-x	2026-05-05 23:08
ancestor_builder.rbs	7.61 KB	-rw-r--r--	2026-04-07 17:22
ancestor_graph.rbs	2.1 KB	-rw-r--r--	2026-04-07 17:22
annotation.rbs	556 B	-rw-r--r--	2026-04-07 17:22
buffer.rbs	718 B	-rw-r--r--	2026-04-07 17:22
builtin_names.rbs	847 B	-rw-r--r--	2026-04-07 17:22
cli.rbs	2.23 KB	-rw-r--r--	2026-04-07 17:22
collection.rbs	41 B	-rw-r--r--	2026-04-07 17:22
comment.rbs	495 B	-rw-r--r--	2026-04-07 17:22
constant.rbs	465 B	-rw-r--r--	2026-04-07 17:22
declarations.rbs	7.62 KB	-rw-r--r--	2026-04-07 17:22
definition.rbs	5.09 KB	-rw-r--r--	2026-04-07 17:22
definition_builder.rbs	5.75 KB	-rw-r--r--	2026-04-07 17:22
diff.rbs	1.42 KB	-rw-r--r--	2026-04-07 17:22
directives.rbs	1.34 KB	-rw-r--r--	2026-04-07 17:22
environment.rbs	8.91 KB	-rw-r--r--	2026-04-07 17:22
environment_loader.rbs	3.79 KB	-rw-r--r--	2026-04-07 17:22
environment_walker.rbs	1.79 KB	-rw-r--r--	2026-04-07 17:22
errors.rbs	10.96 KB	-rw-r--r--	2026-04-07 17:22
factory.rbs	77 B	-rw-r--r--	2026-04-07 17:22
file_finder.rbs	269 B	-rw-r--r--	2026-04-07 17:22
location.rbs	3.3 KB	-rw-r--r--	2026-04-07 17:22
locator.rbs	1.98 KB	-rw-r--r--	2026-04-07 17:22
manifest.yaml	132 B	-rw-r--r--	2026-04-07 17:22
members.rbs	7.76 KB	-rw-r--r--	2026-04-07 17:22
method_builder.rbs	3.17 KB	-rw-r--r--	2026-04-07 17:22
method_types.rbs	1.66 KB	-rw-r--r--	2026-04-07 17:22
namespace.rbs	3.46 KB	-rw-r--r--	2026-04-07 17:22
parser.rbs	2.88 KB	-rw-r--r--	2026-04-07 17:22
rbs.rbs	394 B	-rw-r--r--	2026-04-07 17:22
repository.rbs	2.42 KB	-rw-r--r--	2026-04-07 17:22
sorter.rbs	1.77 KB	-rw-r--r--	2026-04-07 17:22
substitution.rbs	1.47 KB	-rw-r--r--	2026-04-07 17:22
subtractor.rbs	1.77 KB	-rw-r--r--	2026-04-07 17:22
test.rbs	1.83 KB	-rw-r--r--	2026-04-07 17:22
type_alias_dependency.rbs	1.56 KB	-rw-r--r--	2026-04-07 17:22
type_alias_regularity.rbs	3.07 KB	-rw-r--r--	2026-04-07 17:22
type_param.rbs	2.16 KB	-rw-r--r--	2026-04-07 17:22
typename.rbs	2.11 KB	-rw-r--r--	2026-04-07 17:22
types.rbs	12.52 KB	-rw-r--r--	2026-04-07 17:22
use_map.rbs	730 B	-rw-r--r--	2026-04-07 17:22
util.rbs	128 B	-rw-r--r--	2026-04-07 17:22
validator.rbs	2.16 KB	-rw-r--r--	2026-04-07 17:22
variance_calculator.rbs	2.61 KB	-rw-r--r--	2026-04-07 17:22
vendorer.rbs	1.44 KB	-rw-r--r--	2026-04-07 17:22
version.rbs	33 B	-rw-r--r--	2026-04-07 17:22
writer.rbs	3.04 KB	-rw-r--r--	2026-04-07 17:22

Rename

module RBS
  # Substitution from type variables to types.
  #
  # The substitution construction is in _destructive_ manner.
  #
  #    sub = Substitution.new
  #    sub.add(from: :A, to: type1)
  #    sub.add(from: :B, to: type2)
  #    sub.instance_type = type3
  #
  class Substitution
    # A hash containing mapping from type variable name to type.
    attr_reader mapping: Hash[Symbol, Types::t]

# The result of applying this substitution to `instance` type.
    # `nil` maps to `instance` type itself.
    attr_accessor instance_type: Types::t?

def initialize: () -> void

# Add mapping to this substitution.
    # Overwrites the previous mapping if same `from` is given.
    def add: (from: Symbol, to: Types::t) -> void

# Utility method to construct a substitution.
    # Raises an error when `variables.size != types.size`.
    # `instance_type` defaults to `nil`.
    #
    # Yields types in `types` and the block value is used if block is given.
    #
    def self.build: (Array[Symbol] variables, Array[Types::t] types, ?instance_type: Types::t?) ?{ (Types::t) -> Types::t } -> instance

# Applies the substitution to given type.
    def apply: (Types::t) -> Types::t

# Returns a substitution without variables given in `vars`.
    def without: (*Symbol vars) -> Substitution

# Returns true if given substitution is identity.
    def empty?: () -> bool

alias [] apply

# (s1 + s2)[t] == s2[s1[t]]
    # 
    def +: (Substitution) -> Substitution
  end
end