| // RUN: not %target-swiftc_driver -coverage-prefix-map old %s 2>&1 | %FileCheck %s -check-prefix CHECK-INVALID |
| // RUN: %target-swiftc_driver -### -coverage-prefix-map old=new %s 2>&1 | %FileCheck %s -check-prefix CHECK-SIMPLE |
| // RUN: %target-swiftc_driver -### -coverage-prefix-map old=n=ew %s 2>&1 | %FileCheck %s -check-prefix CHECK-COMPLEX |
| // RUN: %target-swiftc_driver -### -coverage-prefix-map old= %s 2>&1 | %FileCheck %s -check-prefix CHECK-EMPTY |
| |
| // CHECK-INVALID: error: values for '-coverage-prefix-map' must be in the format 'original=remapped', but 'old' was provided |
| // CHECK-SIMPLE: coverage-prefix-map old=new |
| // CHECK-COMPLEX: coverage-prefix-map old=n=ew |
| // CHECK-EMPTY: coverage-prefix-map old= |
