* origin/topic/vern/script-xform: (30 commits)
Adjust some Reducer ref-counting and IntrusivePtr usage
Fix reference counting in ListExpr inline/reduce methods
Simplify WhileStmt::CondPredStmt()
Use std::move() in Case::UpdateBody()
Switch some Stmt transform/reduce logic to use IntrusivePtr
Switch some Expr transform/reduce logic to use IntrusivePtr
Adjust how some Expr::SetOpX() calls use std::move()
Add missing header-includes to Reduce.h
Add std::move() for args to an assign_to_index call
Adjust memory management for &default argument expression type-check
Use string for TempVar::name
Switch AnalyOpt::only_func to optional<string>
Fix a signed/unsigned comparison warning
simplified some vestigial complexity I noticed when flipping through diffs
canonicalization for an error message in one of the alternative test baselines
baseline differences for "xform" alternative: changes generally reflect exposure of transformed code, or error propagation stopping earlier due to error now occurring in an assignment (to a temporary)
new testing alternative for script transformation (= xform)
bug in correctly inspecting test output file
split bifs.string_utils into a non-error test and an only-errors test, to help control for differing error propagation
logic for driving the script optimization process
...
* origin/topic/vern/bvu-remove:
Use static_cast instead of dynamic_cast for Val conversions
Remove GET_FIELD_AS macro, replace with template methods
Add templated As() method to Val, use in various places we were using dynamic_cast
Move ValImpl classes into detail namespace
Some review cleanup in Val.cc
Changes addressing pending issues per PR discussion
Remove BroValUnion by hoisting underlying Val subclass values into subclasses
* origin/topic/vern/lambda-copy-semantics:
Add NEWS entries for lambda/capture-list functionality
Tweak vector append/move logic of Frame::SerializeCopyFrame()
Switch FuncType capture-list storage to optional<vector<Capture>>
Fix memory leaks in lambda capture/frame management
tests added for new capture-by-reference closure semantics & errors
documentation updates
test suite updates and additions for new capture semantics & suppression of error cascades
support for transmitting of capture-semantics closures via Broker, while keeping deprecated functionality
minor simplifications in using type names, and unordered sets rather than vectors
changes to Frames to support access to captured-by-copy-semantics variables
changes to ScriptFunc's to track captures, and LambdaExpr's to check/manage them
parsing of new []-style captures, and creation of associated data structures
nit: fixed some 0/1 values that should instead be false/true
no semantic changes: factored some of the complexity of begin_func() into a pair of static functions for clarity
simple error propagation fix: don't complain about "unused" values that themselves are due to errors
no semantic changes: corrected & reflowed some comments, plus a whitespace tweak
