This error message is only given when the constant expression that specifies the number of characters in a string type is not of type integer.
program Produce; type color = (red,green,blue); var S3 : string[Succ(High(color))]; begin end.
The example tries to specify the number of elements in a string as dependent on the maximum element of type color - unfortunately, the element count is of type color, which is illegal.
program Solve; type color = (red,green,blue); var S3 : string[ord(High(color))+1]; begin end.
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