Cannot use generic const parameters in arithmetic operations

impl<T, const R: usize, const C: usize> Matrix<T, R, C>
where
    T: Default + Copy,
{

    pub fn minor_matrix(&self, row: usize, col: usize) -> Matrix<T, { C - 1 }, { R - 1 }> {
        let mut result = Matrix::default();

        let mut new_r = 0;
        for r in 0..R {
            if r == row {
                continue;
            }
            let mut new_c = 0;
            for c in 0..C {
                if c == col {
                    continue;
                }
                result[new_r][new_c] = self[r][c];
                new_c += 1;
            }
            new_r += 1;
        }
        result
    }
}

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