feat: add unused import pass

[tserg]

No description provided.

[BoboTiG]

I would keep only relevant code in those examples, as you did everywhere else. Starting by all those comments, and I'll suggest other removals.

Suggested change

	# @dev Implementation of ERC-20 token standard.
	# @author Takayuki Jimba (@yudetamago)
	# https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20.md

[tserg]

This is from vyper's examples so I prefer leaving it as it is.

[BoboTiG]

Suggested change

	@external
	def mint(_to: address, _value: uint256):
	"""
	@dev Mint an amount of the token and assigns it to an account.
	This encapsulates the modification of balances such that the
	proper events are emitted.
	@param _to The account that will receive the created tokens.
	@param _value The amount that will be created.
	"""
	assert msg.sender == self.minter
	assert _to != empty(address)
	self.totalSupply += _value
	self.balanceOf[_to] += _value
	log Transfer(empty(address), _to, _value)
	@internal
	def _burn(_to: address, _value: uint256):
	"""
	@dev Internal function that burns an amount of the token of a given
	account.
	@param _to The account whose tokens will be burned.
	@param _value The amount that will be burned.
	"""
	assert _to != empty(address)
	self.totalSupply -= _value
	self.balanceOf[_to] -= _value
	log Transfer(_to, empty(address), _value)
	@external
	def burn(_value: uint256):
	"""
	@dev Burn an amount of the token of msg.sender.
	@param _value The amount that will be burned.
	"""
	self._burn(msg.sender, _value)
	@external
	def burnFrom(_to: address, _value: uint256):
	"""
	@dev Burn an amount of the token from a given account.
	@param _to The account whose tokens will be burned.
	@param _value The amount that will be burned.
	"""
	self.allowance[_to][msg.sender] -= _value
	self._burn(_to, _value)

[tserg]

Same comment as above.

[BoboTiG]

This fixes the "implements: interface" check (+ a more pythonic way of checking for a non empty list):

Suggested change

	# Check for `implements`
	is_implemented = (
	len(
	ast.get_descendants(
	vy_ast.AnnAssign,
	{"target.id": "implements", "annotation.id": interface_name},
	)
	)
	> 0
	)
	# Check for `implements`
	is_implemented = bool(
	ast.get_descendants(vy_ast.nodes.ImplementsDecl, {"annotation.id": interface_name})
	)

[BoboTiG]

Suggested change

	is_used = len(ast.get_descendants(vy_ast.Call, {"func.id": interface_name})) > 0
	is_used = bool(ast.get_descendants(vy_ast.Call, {"func.id": interface_name}))

[BoboTiG]

I'll have a second patch to improve performances in all analysis files, but will open a separate PR for that.