Compiler doesn't think foo() and foo(void) are the same type

Originator:an00na
Number:rdar://32661538 Date Originated:June 8 2017, 6:14 PM
Status:DUPLICATE OF 32662741 OPEN Resolved:
Product:Developer Tools Product Version:9.0 beta (9M136h)
Classification:Other Bug Reproducible:Always
 
Summary:
The Fix of the new "This function declaration is not a prototype" warning in Xcode 9 Inserts 'void' into empty function parameter list. But for delegate methods offered by the system SDK the compiler then reports another warning of "Conflicting parameter types" because the method declarations in protocol don't have 'void' and the compiler doesn't think foo() and foo(void) are the same thing.

Steps to Reproduce:
1. Compile sample app.
2. Following the Fix.
3. See the new warning.

Code: https://cloudup.com/c3duAbKKb90

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