Ranges

Range is a range of values from start expression to end expression, represented by anvil.lang.range. Either or both of the expressions can be dropped. The default value for start is negative infinity; the default value for end is positive infinity.

Ranges are especially useful in foreach expressions, where the enumeration returned by map contains values from range ``[start, end[´´ (useful only with integers). Also, some arrays and sequences support ranges inside references, used to return slices.

  range-expr := exprstart ".." exprend 
  range-expr := exprstart ".." 
  range-expr := ".." exprend 
  range-expr := ".." 

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