add new unit test for getScriptLexicalStructure
add new unit test for used and unused imports
Beginning special casing for getOccurrencesAtPosition.
Implemented getOccsAtPos for try-catch-finally.
Made getOccs more resilient.
Fix undefined symbol name in error message
Added tests.
Support for switch/case/default/break in getOccs
Handled function boundaries.
Moved null-guards to appropriate places, added helpers.
Merge branch 'master' into getReferences
Better coverage against function boundaries.
Replaced ES5 functions with analogous core.ts ones.
Made 'isAnyFunction' more exhaustive as it should be.
Addressed CR feedback.
Update type baselines
What's in a name anyhow?
Removed assertion.
Merge pull request #549 from Microsoft/getOccurrences_switchCaseDefault

Get occurrences for switch/case/default/break keywords.