fix #33227, lowering of empty goto loop at top level (#33230)

(cherry picked from commit 5fe17cd)
JuliaLang · Sep 22, 2019 · c494d50 · c494d50
1 parent 7861a35
commit c494d50
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diff --git a/src/jlfrontend.scm b/src/jlfrontend.scm
@@ -97,6 +97,8 @@
  file line)))
  (if (and (null? (cdadr (caddr th)))
  (and (length= (lam:body th) 2)
+ ;; 1-element body might be `return` or `goto` (issue #33227)
+ (return? (cadr (lam:body th)))
  (let ((retval (cadadr (lam:body th))))
  (or (and (pair? retval) (eq? (car retval) 'lambda))
  (simple-atom? retval)))))

diff --git a/test/syntax.jl b/test/syntax.jl
@@ -1935,3 +1935,6 @@ function f33135(x::T) where {C1, T}
  end
 end
 @test f33135(0) == 1
+
+# issue #33227
+@test Meta.isexpr(Meta.lower(Main, :((@label a; @goto a))), :thunk)