From 1fb86d2dae91dbd96ac43011468236380f1ac021 Mon Sep 17 00:00:00 2001
From: Jeff Bezanson <jeff.bezanson@gmail.com>
Date: Wed, 5 Sep 2018 17:49:57 -0400
Subject: [PATCH] fix #28900, macro hygiene bug inside keyword arg values
 (#29043)

---
 src/macroexpand.scm |  4 ++--
 test/syntax.jl      | 11 +++++++++++
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/src/macroexpand.scm b/src/macroexpand.scm
index abad3407656fd..d95e8132ff21e 100644
--- a/src/macroexpand.scm
+++ b/src/macroexpand.scm
@@ -379,12 +379,12 @@
                          ;; in keyword arg A=B, don't transform "A"
                          (unescape (cadr (cadr e))))
                     ,(resolve-expansion-vars- (caddr (cadr e)) env m parent-scope inarg))
-                   ,(resolve-expansion-vars- (caddr e) env m parent-scope inarg)))
+                   ,(resolve-expansion-vars-with-new-env (caddr e) env m parent-scope inarg)))
              (else
               `(kw ,(if inarg
                         (resolve-expansion-vars- (cadr e) env m parent-scope inarg)
                         (unescape (cadr e)))
-                   ,(resolve-expansion-vars- (caddr e) env m parent-scope inarg)))))
+                   ,(resolve-expansion-vars-with-new-env (caddr e) env m parent-scope inarg)))))
 
            ((let)
             (let* ((newenv (new-expansion-env-for e env))
diff --git a/test/syntax.jl b/test/syntax.jl
index 9e12206ad8325..250c73503a711 100644
--- a/test/syntax.jl
+++ b/test/syntax.jl
@@ -1673,3 +1673,14 @@ end
 @test A28593.var.name === :S
 @test B28593.var.name === :S
 @test C28593.var.name === :S
+
+# issue #28900
+macro foo28900(x)
+    quote
+        $x
+    end
+end
+f28900(; kwarg) = kwarg
+let g = @foo28900 f28900(kwarg = x->2x)
+    @test g(10) == 20
+end