a447b5bf6b
At phase 1 and higher, the expander tentatively allows an unbound
identifier so that, for example, `define-for-syntax` can define a
helper function syntactically after a compile-time expression that
uses the helper. While unbound references eventually trigger an error,
the reordering can be consuing, as in the example
#lang racket
(define-syntax (f stx)
(syntax-parse stx
[(_ oops) #'ok]))
which complains about `_` when the real problem is that `syntax-parse`
isn't imported.
To provide better errors, `raise-syntax-error` now implicitly extends
an error message to include a list of previously encountered unbound
identifiersin the current compilation unit. That list will be
non-empty only at phase >= 1. With that change, the error message for the
above example is
bad.rkt:5:5: _: wildcard not allowed as an expression
after encountering unbound identifier (which is possibly the real problem):
syntax-parse
in: (_ oops)
....
Closes #2167
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| INSTALL.txt | ||
| Makefile | ||
| README.md | ||
This is the source code for the core of Racket. See "INSTALL.txt" for full information on building Racket.
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