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Dhruv Manilawala bfc17fecaa Raise syntax error when \ is at end of file (#17409) 
## Summary

This PR fixes a bug in the lexer specifically around line continuation
character at end of file.

The reason this was occurring is because the lexer wouldn't check for
EOL _after_ consuming the escaped newline but only if the EOL was right
after the line continuation character.

fixes: #17398 

## Test Plan

Add tests for the scenarios where this should occur mainly (a) when the
state is `AfterNewline` and (b) when the state is `Other`.
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ruff_python_parser__lexer__tests__assignment.snap
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ruff_python_parser__lexer__tests__bom_with_offset_edge.snap
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ruff_python_parser__lexer__tests__bom_with_offset.snap
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ruff_python_parser__lexer__tests__bom.snap
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ruff_python_parser__lexer__tests__comment_until_mac_eol.snap
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ruff_python_parser__lexer__tests__comment_until_unix_eol.snap
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ruff_python_parser__lexer__tests__comment_until_windows_eol.snap
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ruff_python_parser__lexer__tests__dedent_after_whitespace.snap
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ruff_python_parser__lexer__tests__double_dedent_with_mac_eol.snap
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ruff_python_parser__lexer__tests__double_dedent_with_tabs_mac_eol.snap
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ruff_python_parser__lexer__tests__double_dedent_with_tabs_unix_eol.snap
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ruff_python_parser__lexer__tests__double_dedent_with_tabs_windows_eol.snap
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ruff_python_parser__lexer__tests__double_dedent_with_unix_eol.snap
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ruff_python_parser__lexer__tests__double_dedent_with_windows_eol.snap
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ruff_python_parser__lexer__tests__emoji_identifier.snap
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ruff_python_parser__lexer__tests__empty_fstrings.snap
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ruff_python_parser__lexer__tests__empty_ipython_escape_command.snap
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ruff_python_parser__lexer__tests__escape_unicode_name.snap
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ruff_python_parser__lexer__tests__fstring_comments.snap
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ruff_python_parser__lexer__tests__fstring_conversion.snap
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ruff_python_parser__lexer__tests__fstring_escape_braces.snap
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ruff_python_parser__lexer__tests__fstring_escape_raw.snap
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ruff_python_parser__lexer__tests__fstring_escape.snap
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ruff_python_parser__lexer__tests__fstring_expression_multiline.snap
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ruff_python_parser__lexer__tests__fstring_multiline.snap
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ruff_python_parser__lexer__tests__fstring_named_unicode_raw.snap
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ruff_python_parser__lexer__tests__fstring_named_unicode.snap
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ruff_python_parser__lexer__tests__fstring_nested.snap
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ruff_python_parser__lexer__tests__fstring_parentheses.snap
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ruff_python_parser__lexer__tests__fstring_prefix.snap
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ruff_python_parser__lexer__tests__fstring_single_quote_escape_mac_eol.snap
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ruff_python_parser__lexer__tests__fstring_single_quote_escape_unix_eol.snap
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ruff_python_parser__lexer__tests__fstring_single_quote_escape_windows_eol.snap
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ruff_python_parser__lexer__tests__fstring_with_format_spec.snap
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ruff_python_parser__lexer__tests__fstring_with_ipy_escape_command.snap
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ruff_python_parser__lexer__tests__fstring_with_lambda_expression.snap
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ruff_python_parser__lexer__tests__fstring_with_multiline_format_spec.snap
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ruff_python_parser__lexer__tests__fstring_with_named_expression.snap
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ruff_python_parser__lexer__tests__fstring_with_nul_char.snap
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ruff_python_parser__lexer__tests__fstring.snap
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ruff_python_parser__lexer__tests__indentation_with_mac_eol.snap
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ruff_python_parser__lexer__tests__indentation_with_unix_eol.snap
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ruff_python_parser__lexer__tests__indentation_with_windows_eol.snap
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ruff_python_parser__lexer__tests__invalid_leading_zero_big.snap
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ruff_python_parser__lexer__tests__invalid_leading_zero_small.snap
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ruff_python_parser__lexer__tests__ipython_escape_command_assignment.snap
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ruff_python_parser__lexer__tests__ipython_escape_command_indentation.snap
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ruff_python_parser__lexer__tests__ipython_escape_command_line_continuation_mac_eol.snap
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ruff_python_parser__lexer__tests__ipython_escape_command_line_continuation_unix_eol.snap
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ruff_python_parser__lexer__tests__ipython_escape_command_line_continuation_windows_eol.snap
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ruff_python_parser__lexer__tests__ipython_escape_command_line_continuation_with_mac_eol_and_eof.snap
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ruff_python_parser__lexer__tests__ipython_escape_command_line_continuation_with_unix_eol_and_eof.snap
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ruff_python_parser__lexer__tests__ipython_escape_command_line_continuation_with_windows_eol_and_eof.snap
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ruff_python_parser__lexer__tests__ipython_escape_command.snap
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ruff_python_parser__lexer__tests__ipython_help_end_escape_command.snap
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ruff_python_parser__lexer__tests__line_comment_empty.snap
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ruff_python_parser__lexer__tests__line_comment_long.snap
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ruff_python_parser__lexer__tests__line_comment_single_whitespace.snap
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ruff_python_parser__lexer__tests__line_comment_whitespace.snap
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ruff_python_parser__lexer__tests__line_continuation_at_eof_after_newline_mac_eol.snap
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ruff_python_parser__lexer__tests__line_continuation_at_eof_after_newline_unix_eol.snap
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ruff_python_parser__lexer__tests__line_continuation_at_eof_after_newline_windows_eol.snap
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ruff_python_parser__lexer__tests__line_continuation_at_eof_mac_eol.snap
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ruff_python_parser__lexer__tests__line_continuation_at_eof_unix_eol.snap
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ruff_python_parser__lexer__tests__line_continuation_at_eof_windows_eol.snap
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ruff_python_parser__lexer__tests__logical_newline_line_comment.snap
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ruff_python_parser__lexer__tests__match_softkeyword_in_notebook.snap
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ruff_python_parser__lexer__tests__newline_in_brackets_mac_eol.snap
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ruff_python_parser__lexer__tests__newline_in_brackets_unix_eol.snap
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ruff_python_parser__lexer__tests__newline_in_brackets_windows_eol.snap
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ruff_python_parser__lexer__tests__non_logical_newline_in_string_continuation.snap
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ruff_python_parser__lexer__tests__numbers.snap
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ruff_python_parser__lexer__tests__operators.snap
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ruff_python_parser__lexer__tests__string_continuation_with_mac_eol.snap
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ruff_python_parser__lexer__tests__string_continuation_with_unix_eol.snap
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ruff_python_parser__lexer__tests__string_continuation_with_windows_eol.snap
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ruff_python_parser__lexer__tests__string.snap
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ruff_python_parser__lexer__tests__tet_too_low_dedent.snap
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ruff_python_parser__lexer__tests__triple_quoted_mac_eol.snap
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ruff_python_parser__lexer__tests__triple_quoted_unix_eol.snap
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ruff_python_parser__lexer__tests__triple_quoted_windows_eol.snap
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ruff_python_parser__string__tests__backspace_alias.snap
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ruff_python_parser__string__tests__bell_alias.snap
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ruff_python_parser__string__tests__carriage_return_alias.snap
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ruff_python_parser__string__tests__character_tabulation_with_justification_alias.snap
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ruff_python_parser__string__tests__delete_alias.snap
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ruff_python_parser__string__tests__dont_panic_on_8_in_octal_escape.snap
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ruff_python_parser__string__tests__double_quoted_byte.snap
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ruff_python_parser__string__tests__escape_alias.snap
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ruff_python_parser__string__tests__escape_char_in_byte_literal.snap
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ruff_python_parser__string__tests__escape_octet.snap
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ruff_python_parser__string__tests__form_feed_alias.snap
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ruff_python_parser__string__tests__fstring_constant_range.snap
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ruff_python_parser__string__tests__fstring_escaped_character.snap
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ruff_python_parser__string__tests__fstring_escaped_newline.snap
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ruff_python_parser__string__tests__fstring_line_continuation.snap
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ruff_python_parser__string__tests__fstring_parse_self_documenting_base_more.snap
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ruff_python_parser__string__tests__fstring_parse_self_documenting_base.snap
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ruff_python_parser__string__tests__fstring_parse_self_documenting_format.snap
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ruff_python_parser__string__tests__fstring_unescaped_newline.snap
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ruff_python_parser__string__tests__hts_alias.snap
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ruff_python_parser__string__tests__invalid_byte_literal_error.snap
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ruff_python_parser__string__tests__invalid_unicode_literal.snap
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ruff_python_parser__string__tests__invalid_unicode_name_error.snap
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ruff_python_parser__string__tests__missing_unicode_lbrace_error.snap
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ruff_python_parser__string__tests__missing_unicode_rbrace_error.snap
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ruff_python_parser__string__tests__parse_empty_fstring.snap
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ruff_python_parser__string__tests__parse_f_string_concat_1.snap
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ruff_python_parser__string__tests__parse_f_string_concat_2.snap
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ruff_python_parser__string__tests__parse_f_string_concat_3.snap
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ruff_python_parser__string__tests__parse_f_string_concat_4.snap
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ruff_python_parser__string__tests__parse_fstring_equals.snap
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ruff_python_parser__string__tests__parse_fstring_nested_concatenation_string_spec.snap
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ruff_python_parser__string__tests__parse_fstring_nested_spec.snap
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ruff_python_parser__string__tests__parse_fstring_nested_string_spec.snap
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ruff_python_parser__string__tests__parse_fstring_not_equals.snap
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ruff_python_parser__string__tests__parse_fstring_not_nested_spec.snap
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ruff_python_parser__string__tests__parse_fstring_self_doc_prec_space.snap
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ruff_python_parser__string__tests__parse_fstring_self_doc_trailing_space.snap
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ruff_python_parser__string__tests__parse_fstring_yield_expr.snap
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ruff_python_parser__string__tests__parse_fstring.snap
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ruff_python_parser__string__tests__parse_string_concat.snap
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ruff_python_parser__string__tests__parse_string_triple_quotes_with_kind.snap
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ruff_python_parser__string__tests__parse_u_f_string_concat_1.snap
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ruff_python_parser__string__tests__parse_u_f_string_concat_2.snap
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ruff_python_parser__string__tests__parse_u_string_concat_1.snap
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ruff_python_parser__string__tests__parse_u_string_concat_2.snap
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ruff_python_parser__string__tests__raw_byte_literal_1.snap
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ruff_python_parser__string__tests__raw_byte_literal_2.snap
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ruff_python_parser__string__tests__raw_fstring.snap
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ruff_python_parser__string__tests__single_quoted_byte.snap
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ruff_python_parser__string__tests__string_parser_escaped_mac_eol.snap
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ruff_python_parser__string__tests__string_parser_escaped_unix_eol.snap
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ruff_python_parser__string__tests__string_parser_escaped_windows_eol.snap
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ruff_python_parser__string__tests__triple_quoted_raw_fstring.snap
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