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Expansion context analyzer #685
Description
Whenever a form is being expanded, the result of syntax-local-context has one of five values: 'expression, 'top-level, 'module, 'module-begin, or a value representing a specific definition context. This is useful information to know when inside refactoring rules, as it can affect what sort of transformations might be possible or reasonable. There should be a custom expansion analyzer that labels the expansion context of all forms in the fully expanded syntax. Here's some test cases:
#lang resyntax/test
header: - #lang racket/base
analysis-test: "code in a module is in a module context"
- (+ 1 2 3)
@inspect - (+ 1 2 3)
@property expansion-context
@assert module
analysis-test "function arguments are in an expression context"
- (+ 1 2 3)
@inspect - 2
@property expansion-context
@assert expression
analysis-test "code in a function body is in an internal definition context"
--------------------
(define (f)
(+ 1 2 3))
--------------------
@inspect - (+ 1 2 3)
@property expansion-context
@assert internal-definition
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