Starts a high-rank array. Entries must be separated by , or ⋄. These must have the same shape. They become major cells of the result.

Must end with a corresponding ].

    ["abc", "def"]
┌─     
╵"abc  
  def" 
      ┘

    [↕4, ↕5]
Error: […]: Incompatible element shapes (encountered shapes ⟨4⟩ and ⟨5⟩)

Left Square Bracket (`[`)

`[ ...`: Begin array