Handle undef refs in jl_copy_ast, fixes #9475

[ci skip] checked on branch fix9475 passed osx passed linux except for some network issue cloning package.
JuliaLang · Dec 30, 2014 · cb1290e · cb1290e · vtjnash · Dec 30, 2014
1 parent e6e4c0c
commit cb1290e
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Showing 2 changed files with 10 additions and 1 deletion.
diff --git a/src/ast.c b/src/ast.c
@@ -769,7 +769,10 @@ static jl_value_t *copy_ast(jl_value_t *expr, jl_tuple_t *sp, int do_sp)
 
 DLLEXPORT jl_value_t *jl_copy_ast(jl_value_t *expr)
 {
-    if (jl_is_expr(expr)) {
+    if (expr == NULL) {
+        return NULL;
+    }
+    else if (jl_is_expr(expr)) {
         jl_expr_t *e = (jl_expr_t*)expr;
         size_t i, l = jl_array_len(e->args);
         jl_expr_t *ne = NULL;

diff --git a/test/core.jl b/test/core.jl
@@ -1976,3 +1976,9 @@ function f9134()
     end
 end
 @test_throws UndefVarError f9134()
+
+# issue #9475
+module I9475
+    arr = Array(Any, 1)
+    @eval @eval $arr[1] = 1
+end