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+# Interaction with other language features:
+
+General concerns:
+- [ ] Error handling/recovery
+    - [ ] Errors in parsing
+    - [ ] Error handling for semantic errors (e.g. ambiguous lookup, inaccessible lookup, wrong kind of thing found, instance vs static thing found, wrong type for the context, value vs variable)
+- [ ] Public interface of compiler APIs, backcompat scenarios
+- [ ] Determinism
+- [ ] Atomicity
+- [ ] Edit-and-continue
+- [ ] Completeness of the specification as a guide for testing (e.g. is the spec complete enough to suggest what the compiler should do in each scenario?)
+- [ ] Other external documentation
+- [ ] Performance
+
+Types and members:
+- [ ] Access modifiers (public, protected, internal, protected internal, private), static modifier
+- [ ] Parameter modifiers (ref, out, params)
+- [ ] Attributes (including security attribute)
+- [ ] Generics (type arguments, constraints, variance)
+- [ ] default value
+- [ ] partial classes
+- [ ] literals
+- [ ] enum (implicit vs. explicit underlying type)
+- [ ] expression trees
+- [ ] Iterators
+- [ ] Initializers (object, collection, dictionary)
+- [ ] array (single- or multi-dimensional, jagged, initilalizer)
+- [ ] Expression-bodied methods/properties/...
+- [ ] Extension methods
+- [ ] Partial method
+- [ ] Named and optional parameters
+- [ ] String interpolation
+- [ ] Properties (read-write, read-only, write-only, auto-property, expression-bodied)
+- [ ] Interfaces (implicit vs. explicit interface member implementation)
+- [ ] delegates
+- [ ] Multi-declaration
+
+Code:
+- [ ] Operators (see Eric's list)
+    - [ ] Operator overloading
+- [ ] Lvalues: the synthesized fields are mutable
+    - [ ] Ref / out parameters
+    - [ ] Compound operators (+=, /=, etc ..)
+    - [ ] Assignment exprs
+- [ ] lambdas (capture of parameters or locals, target typing)
+- [ ] execution order
+- [ ] Target typing (var, lambdas, integrals)
+- [ ] Type inference
+- [ ] Conversions
+    - [ ] Implicit (identity, implicit numeric, implicit enumeration, implicit nullable, null litaral, implicit reference, boxing, implicit dynamic, implicit constant, user-defined implicit conversion, anonymous function, method group)
+    - [ ] Explicit (numeric, enumeration, nullable, reference, unboxing, dynamic, user-defined)
+    - [ ] Anonymous functions
+- [ ] nullable (wrapping, unwrapping)
+- [ ] OHI
+    - [ ] inheritance (virtual, override, abstract, new)
+    - [ ] overload resolution
+- [ ] Anonymous types
+- [ ] Unsafe code
+- [ ] LINQ
+- [ ] constructors, properties, indexers, events, operators, and destructors.
+- [ ] Async
+- [X] Var
+
+Misc:
+- [ ] reserved keywords (sometimes contextual)
+- [ ] pre-processing directives
+- [ ] COM interop