error_custom_interpolation.swift

// REQUIRES: swift_swift_parser

// RUN: %empty-directory(%t)
// RUN: %target-swift-frontend %s -swift-version 5 -module-name main -disable-availability-checking -typecheck -verify -plugin-path %swift-plugin-dir

extensionDefaultStringInterpolation{
fileprivatefunc appendInterpolation(custom:Int){}
fileprivatefunc appendInterpolation<A, B>(_ a:A, _ b:B){}
}

@DebugDescription
structMyStruct1{
 // expected-error @+1 {{unsupported custom string interpolation expression}}
vardebugDescription:String{"\(custom:30)"}
}

@DebugDescription
structMyStruct2{
 // expected-error @+1 {{unsupported custom string interpolation expression}}
vardebugDescription:String{"\(30,true)"}
}