You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: all_solvers.m
    path of file: ./repos/prima/benchmark/rescue_idz/norma/matlab/interfaces/private
    
    the code of the file until where you have to start completion: function solver_list = all_solvers(solver_type)
%ALL_SOLVERS returns a cell array containing the names of all the solvers of `solver_type` contained
% in this package.

callstack = dbstack;
funname = callstack(1).name; % Name of the current function

    
function solver_list = all_solvers(solver_type)
%ALL_SOLVERS returns a cell array containing the names of all the solvers of `solver_type` contained
% in this package.

callstack = dbstack;
funname = callstack(1).name; % Name of the current function

if nargin > 1 || (nargin == 1 && ~ischarstr(solver_type))
    % Private/unexpected error
    error(sprintf('%s:InvalidInput', funname), '%s: UNEXPECTED ERROR: invalid input received', funname);
end