While `initialize` pretended it had the declaration name of the constant
to be initialized, missing declaration ranges for the latter led call
hierarchy etc. to ignore the definition
We must search the environment extension first, and then the builtin
table. Otherwise, the builtin declarations do not change when we
modify the files.
closes#1021
We need to report the jump target range in terms of a UTF-16 offset within the line, but to compute that we would have to load the target file, file-map it, and resolve that way each time the go-to-def handler runs. As an alternative, this stores the UTF-16 offsets in `DeclarationRange`.
