semi as lib

remix/core.rkt

@@ -1,17 +1,13 @@
 #lang racket/base
-(require (for-syntax racket/base
+(require remix/semi
+         (for-syntax racket/base
                      syntax/parse))
 
-(define-syntax (#%semi stx)
-  (raise-syntax-error '#%semi "illegal outside of block" stx))
-
 (define-syntax (remix-module-begin stx)
   (syntax-parse stx
-    #:literals (#%semi)
-    [(_ (~seq (~and semi-form (~not #%semi)) ... #%semi) ...
-        (~and tail-form (~not #%semi)) ...)
+    [(_ s:semi-seq)
      (syntax/loc stx
-       (#%module-begin (semi-form ...) ... tail-form ...))]))
+       (#%module-begin s.semi-form ... s.tail-form ...))]))
 
 (provide (rename-out
           [remix-module-begin #%module-begin])

remix/semi.rkt

@@ -0,0 +1,17 @@
+#lang racket/base
+(require (for-syntax racket/base
+                     syntax/parse))
+
+(define-syntax (#%semi stx)
+  (raise-syntax-error '#%semi "illegal outside of block" stx))
+
+(begin-for-syntax
+  (define-splicing-syntax-class semi-seq
+    #:literals (#%semi)
+    #:attributes ([semi-form 1] [tail-form 1])
+    (pattern (~seq (~seq (~and semi-piece-form (~not #%semi)) ... #%semi) ...
+                   (~and tail-form (~not #%semi)) ...)
+             #:attr [semi-form 1] (syntax->list #'((semi-piece-form ...) ...)))))
+
+(provide #%semi
+         (for-syntax semi-seq))

remix/stx0.rkt

@@ -5,6 +5,7 @@
                      racket/generic
                      racket/syntax
                      syntax/parse)
+         remix/semi
          syntax/quote
          syntax/parse/define
          remix/stx/singleton-struct0