The Nest
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Compiler projects using llvm 
RUN: not llvm-cov show -instr-profile=%t.nonexistent.profdata %t.nonexistent 2>&1 | FileCheck %s
RUN: not llvm-cov export -instr-profile=%t.nonexistent.profdata %t.nonexistent 2>&1 | FileCheck %s
RUN: not llvm-cov report -instr-profile=%t.nonexistent.profdata %t.nonexistent 2>&1 | FileCheck %s

CHECK: nonexistent.profdata: Could not read profile data!