let summary = [{
Copy a tensor setting everything outside a central band in each innermost matrix to zero.
  }];

  let description = [{
The `band` part is computed as follows:
Assume `input` has `k` dimensions `[I, J, K, ..., M, N]`, then the output is a
tensor with the same shape where

27F0..27FF    ; valid                  ;      ; NV8    # 3.2  UPWARDS QUADRUPLE ARROW..LONG RIGHTWARDS SQUIGGLE ARROW
2800..28FF    ; valid                  ;      ; NV8    # 3.0  BRAILLE PATTERN BLANK..BRAILLE PATTERN DOTS-12345678
2900..2A0B    ; valid                  ;      ; NV8    # 3.2  RIGHTWARDS TWO-HEADED ARROW WITH VERTICAL STROKE..SUMMATION WITH INTEGRAL

		{"IMPORT", Const, 0},
		{"INC", Const, 0},
		{"INT", Const, 0},
		{"INTERFACE", Const, 0},
		{"IsExported", Func, 13},
		{"IsIdentifier", Func, 13},
		{"IsKeyword", Func, 13},
		{"LAND", Const, 0},
		{"LBRACE", Const, 0},
		{"LBRACK", Const, 0},
		{"LEQ", Const, 0},
		{"LOR", Const, 0},
		{"LPAREN", Const, 0},
		{"LSS", Const, 0},
		{"Lookup", Func, 0},
		{"LowestPrec", Const, 0},