codegen/smithy-ruby-codegen/src/main/java/software/amazon/smithy/ruby/codegen/generators/RestStubsGeneratorBase.java [307:318]:
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        public Void listShape(ListShape shape) {
            writer.openBlock("unless $1L.nil? || $1L.empty?", inputGetter)
                    .write("$1L$2L", dataSetter, inputGetter)
                    .indent()
                    .write(".compact")
                    .call(() -> model.expectShape(shape.getMember().getTarget())
                            .accept(new HeaderListMemberSerializer(shape.getMember())))
                    .write(".join(', ')")
                    .dedent()
                    .closeBlock("end");
            return null;
        }
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codegen/smithy-ruby-codegen/src/main/java/software/amazon/smithy/ruby/codegen/generators/RestBuilderGeneratorBase.java [386:397]:
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        public Void listShape(ListShape shape) {
            writer.openBlock("unless $1L.nil? || $1L.empty?", inputGetter)
                    .write("$1L$2L", dataSetter, inputGetter)
                    .indent()
                    .write(".compact")
                    .call(() -> model.expectShape(shape.getMember().getTarget())
                            .accept(new HeaderListMemberSerializer(shape.getMember())))
                    .write(".join(', ')")
                    .dedent()
                    .closeBlock("end");
            return null;
        }
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