Fork channel

Create a new channel as a copy of main.

Rename channel

Rename main to:

Delete channel

Delete main? This cannot be undone.

incorrect-format.test
; RUN: mkdir -p %t
; RUN: yaml2obj %S/Inputs/macho.yaml -o %t/macho.dylib
; RUN: not llvm-tapi-diff %S/Inputs/v4A.tbd %t/macho.dylib 2>&1 | FileCheck %s

; CHECK: error: {{.*}}macho.dylib' unsupported file format
; CHECK-NOT: error:
; CHECK-NOT: warning: