Cannot create mapping method with single primitive argument

使用 MapStruct 1.6.3 运行提供的 PrimitiveMapperTest reproducer，并将单个基本类型参数的情况与 issue 中描述的两个参数的情况进行比较。跟踪 annotation processor 对 PrimitiveMapper.map(long value); 的处理。单参数映射方法成功生成且测试通过，即表示完成。

Expected behavior

Given a mapping method which takes a single argument of primitive long, like below:

import org.junit.jupiter.api.*;
import org.mapstruct.*;
import org.mapstruct.factory.Mappers;

import static org.assertj.core.api.Assertions.assertThat;

class PrimitiveMapperTest {

    @Test
    @DisplayName("should convert primitive type")
    void shouldConvertPrimitiveType() {
        var mapper = Mappers.getMapper(PrimitiveMapper.class);
        var target = mapper.map(123);
        assertThat(target.value()).isEqualTo(123);
    }

    protected record Target(long value) {}
}

@Mapper
abstract class PrimitiveMapper {
    @Mapping(target = "value", source = "value")
    public abstract PrimitiveMapperTest.Target map(long value);
}

An expectation is that the mapping method is generated and the test passes.

(Mapstruct is configured with -Amapstruct.unmappedTargetPolicy=ERROR)

Actual behavior

Compilation fails with a message:

java: Can't generate mapping method with primitive parameter type.

Funny enough, it starts working after adding a 2nd argument which could also be of a primitive (sic!) type. I could make the above example working like this:

    ...
    public abstract PrimitiveMapperTest.Target map(long value, long unused);

Steps to reproduce the problem

See above

MapStruct Version

1.6.3