Why are the code is warning that “Function has redundant suspend modifier.” in detekt ?

[tmdgusya]

Dependency

import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.delay
import kotlinx.coroutines.launch
import kotlinx.coroutines.runBlocking

[cortinico]

Please don't post screenshots. It's extremely hard for us as we can't copy and paste your code.

[schalkms]

The posted code doesn't trigger the RedundantSuspendModifier rule during my test with the following test code snippet.
I think type resolution isn't correctly configured in your project.

@Test
fun `discussion #5231`() {
    val code = """
        import kotlinx.coroutines.Dispatchers
        import kotlinx.coroutines.delay
        import kotlinx.coroutines.launch
        import kotlinx.coroutines.runBlocking

        class Test {

            fun networkRequestTest() {
                runBlocking(Dispatchers.IO) {
                    doNetworkRequest("test1")
                    doNetworkRequest("test2")
                }
            }

            private suspend fun doNetworkRequest(name: String) {
                if (name == "11") {
                    throw IllegalArgumentException()
                }
                delay(1000L)
            }
        }
    """
    assertThat(subject.compileAndLintWithContext(env, code)).isEmpty()
}