When parsing we save the token value to the syntax tree. This is
useful for better error reporting. Use it to report an invalid
entity for the slice operation. Before only the memory location
was reported, which is not a good error message.
Before:
% dftest '"01:02:03:04"[0:3] == foo'
Filter: ""01:02:03:04"[0:3] == foo"
dftest: Range is not supported for entity <0x7f6c84017740> of type STRING
After:
% dftest '"01:02:03:04"[0:3] == foo'
Filter: ""01:02:03:04"[0:3] == foo"
dftest: Range is not supported for entity 01:02:03:04 of type STRING
When creating a new node from an old one we need to copy the token
value. Simple tokens such as RBRACKET, COMMA and COLON are
not part of the AST and don't have an associated semantic value.
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