[Bug-Candidate]: solc_parsing for var[x][] dynamic arrays fails when inside top level struct

[plotchy]

Describe the issue:

Testing parser on various types and noticed this particular type fails to be parsed.

Type is used in solidity docs as bool[2][] pairsOfFlags;
https://docs.soliditylang.org/en/latest/types.html?highlight=array#allocating-memory-arrays

Code example to reproduce the issue:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

struct my_struct {
    uint[][] a; // works fine
    uint[][3] b; // works fine
    uint[3][] c; // fails
    uint[3][3] d; // fails
    uint[2**20] e; // works fine
}
contract BaseContract{
    struct my_struct_2 {
        uint[][] f; // works fine
        uint[][3] g; // works fine
        uint[3][] h; // works fine
        uint[3][3] i; // works fine
        uint[2**20] j; // works fine
    }
    
    uint[3][] k; // works fine
}

Version:

0.8.3

Relevant log output:

Error in a.sol Traceback (most recent call last): File "/home/plotchy/code/packages/slither/slither/main.py", line 755, in main_impl ) = process_all(filename, args, detector_classes, printer_classes) File "/home/plotchy/code/packages/slither/slither/main.py", line 87, in process_all ) = process_single(compilation, args, detector_classes, printer_classes) File "/home/plotchy/code/packages/slither/slither/main.py", line 70, in process_single slither = Slither(target, ast_format=ast, **vars(args)) File "/home/plotchy/code/packages/slither/slither/slither.py", line 118, in init parser.parse_contracts() File "/home/plotchy/code/packages/slither/slither/solc_parsing/slither_compilation_unit_solc.py", line 485, in parse_contracts self._analyze_second_part(contracts_to_be_analyzed, libraries) File "/home/plotchy/code/packages/slither/slither/solc_parsing/slither_compilation_unit_solc.py", line 553, in _analyze_second_part self._analyze_top_level_structures() File "/home/plotchy/code/packages/slither/slither/solc_parsing/slither_compilation_unit_solc.py", line 631, in _analyze_top_level_structures struct.analyze() File "/home/plotchy/code/packages/slither/slither/solc_parsing/declarations/structure_top_level.py", line 57, in analyze elem_parser.analyze(self) File "/home/plotchy/code/packages/slither/slither/solc_parsing/variables/variable_declaration.py", line 210, in analyze self._variable.type = parse_type(self._elem_to_parse, caller_context) File "/home/plotchy/code/packages/slither/slither/solc_parsing/solidity_types/type_parsing.py", line 401, in parse_type array_type = parse_type(t["baseType"], next_context) File "/home/plotchy/code/packages/slither/slither/solc_parsing/solidity_types/type_parsing.py", line 400, in parse_type length = parse_expression(t["length"], caller_context) File "/home/plotchy/code/packages/slither/slither/solc_parsing/expressions/expression_parsing.py", line 255, in parse_expression assert isinstance(caller_context, CallerContextExpression) AssertionError