Return type of suspend function not considered for public API

[eygraber]

Plugin version 2.5.0

Gradle version 8.11.1

JDK version 22

Kotlin and Kotlin Gradle Plugin (KGP) version 2.0.21

Android Gradle Plugin (AGP) version 8.7.2

Describe the bug I have 3 modules:

module A

interface MyResult

module B (api(projects.A))

interface Foo {
  suspend fun bar(): MyResult
}

module C (implementation(projects.B), implementation(projects.A))

class Baz(
  private val foo: Foo,
) {
  suspend fun bing() {
    foo.bar()
  }
}

Running buildHealth fails with:

> Advice for :B
  Existing dependencies which should be modified to be as indicated:
    implementation(projects.A) (was api)
  
  Advice for :C
  Unused dependencies which should be removed:
    implementation(projects.A)

Running :B:reason --id :A:

------------------------------------------------------------
You asked about the dependency ':A'.
You have been advised to change this dependency to 'implementation' from 'api'.
------------------------------------------------------------

Source: devDebug, main
----------------------
* Imports 1 class: MyResult (implies implementation).

Running :B:reason --id :A:

------------------------------------------------------------
You asked about the dependency ':A'.
You have been advised to remove this dependency from 'implementation'.
------------------------------------------------------------

Source: devDebug, main
----------------------
(no usages)

If I follow the advice then compiling C fails:

e: Baz.kt:20:52 Cannot access class 'MyResult'. Check your module classpath for missing or conflicting dependencies.

[eygraber]

repro.zip

Running ./gradlew buildHealth on the repro above fails only when foo is a suspending function in services/foo/public/src/main/kotlin/template/services/foo/Foo.kt.

[autonomousapps]

Thanks for the report. I note the description of the issue (in the text) doesn't include any suspend functions. Does the repro contain suspend functions? (I haven't downloaded it yet.) If so, could you update the description?

[eygraber]

Updated. The repro project looks pretty different though, the description here was originally derived from that.