Exclude print from "function return value in args" check (#1165)

Fixes #1163

Signed-off-by: Anders Eknert <[email protected]>

bundle/regal/ast/ast.rego

@@ -298,6 +298,9 @@ function_ret_args(fn_name, terms) := array.slice(terms, count(all_functions[fn_n
 # METADATA
 # description: true if last argument of function is a return assignment
 function_ret_in_args(fn_name, terms) if {
+	# special case: print does not have a last argument as it's variadic
+	fn_name != "print"
+
 	rest := array.slice(terms, 1, count(terms))
 
 	# for now, bail out of nested calls

bundle/regal/rules/bugs/var-shadows-builtin/var_shadows_builtin_test.rego

@@ -40,3 +40,11 @@ test_success_var_does_not_shadow_builtin if {
 	r := rule.report with input as module with data.internal.combined_config as {"capabilities": capabilities.provided}
 	r == set()
 }
+
+# https://github.com/StyraInc/regal/issues/1163
+test_success_print_excluded if {
+	module := ast.with_rego_v1(`x if print([y - 1])`)
+
+	r := rule.report with input as module with data.internal.combined_config as {"capabilities": capabilities.provided}
+	r == set()
+}