For most builtin declarations, the selection range is just its name, which is stored in the second position. Example:

"def " >> declId >> optDeclSig >> declVal

If the declaration name is absent, we use the keyword instead. This function converts the given Syntax into one that represents its "selection range".

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    Store the range and selectionRange for declName where stx is the whole syntax object decribing declName. This method is for the builtin declarations only. User-defined commands should use Lean.addDeclarationRanges to store this information for their commands.

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      Auxiliary method for recording ranges for auxiliary declarations (e.g., fields, nested declarations, etc.

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