bug284.go:33: error: invalid type conversion
bug284.go:36: error: invalid type conversion (cannot use type A2 as type A1)
bug284.go:37: error: invalid type conversion
bug284.go:38: error: invalid type conversion (cannot use type A1 as type A2)
bug284.go:56: error: invalid type conversion
bug284.go:59: error: invalid type conversion (cannot use type S2 as type S1)
bug284.go:60: error: invalid type conversion
bug284.go:61: error: invalid type conversion (cannot use type S1 as type S2)
bug284.go:71: error: invalid type conversion
bug284.go:74: error: invalid type conversion (cannot use type P2 as type P1)
bug284.go:75: error: invalid type conversion
bug284.go:76: error: invalid type conversion (cannot use type P1 as type P2)
bug284.go:96: error: invalid type conversion
bug284.go:99: error: invalid type conversion (cannot use type Q2 as type Q1)
bug284.go:101: error: invalid type conversion (cannot use type Q1 as type Q2)
bug284.go:111: error: invalid type conversion (different parameter types)
bug284.go:114: error: invalid type conversion (different parameter types)
bug284.go:115: error: invalid type conversion (different parameter types)
bug284.go:116: error: invalid type conversion (different parameter types)
bug284.go:134: error: invalid type conversion (incompatible type for method 'f' (different result types))
bug284.go:137: error: invalid type conversion (incompatible type for method 'f' (different result types))
bug284.go:138: error: invalid type conversion (incompatible type for method 'f' (different result types))
bug284.go:139: error: invalid type conversion (incompatible type for method 'f' (different result types))
bug284.go:149: error: invalid type conversion
bug284.go:152: error: invalid type conversion (cannot use type L2 as type L1)
bug284.go:153: error: invalid type conversion
bug284.go:154: error: invalid type conversion (cannot use type L1 as type L2)
bug284.go:164: error: invalid type conversion
bug284.go:167: error: invalid type conversion (cannot use type L2 as type L1)
bug284.go:168: error: invalid type conversion
bug284.go:169: error: invalid type conversion (cannot use type L1 as type L2)
bug284.go:179: error: invalid type conversion
bug284.go:182: error: invalid type conversion (cannot use type C2 as type C1)
bug284.go:183: error: invalid type conversion
bug284.go:184: error: invalid type conversion (cannot use type C1 as type C2)

R=rsc
CC=golang-dev
https://golang.org/cl/2136041