[FileCheck] Make invalid prefix diagnostics more precise

This will prove especially helpful after D79276, which introduces
comment prefixes.  Specifically, identifying whether there's a
uniqueness violation will be helpful as prefixes will be required to
be unique across both check prefixes and comment prefixes.

Also, remove a related comment about `cl::list` that no longer seems
relevant now that FileCheck is also a library.

Reviewed By: jhenderson, thopre

Differential Revision: https://reviews.llvm.org/D79375

1 files changed, 1 insertions, 5 deletions

diff --git a/llvm/utils/FileCheck/FileCheck.cpp b/llvm/utils/FileCheck/FileCheck.cpp
index 3f7d777..46821ec 100644
--- a/llvm/utils/FileCheck/FileCheck.cpp
+++ b/llvm/utils/FileCheck/FileCheck.cpp
@@ -601,12 +601,8 @@ int main(int argc, char **argv) {
     Req.Verbose = true;
 
   FileCheck FC(Req);
-  if (!FC.ValidateCheckPrefixes()) {
-    errs() << "Supplied check-prefix is invalid! Prefixes must be unique and "
-              "start with a letter and contain only alphanumeric characters, "
-              "hyphens and underscores\n";
+  if (!FC.ValidateCheckPrefixes())
     return 2;
-  }
 
   Regex PrefixRE = FC.buildCheckPrefixRegex();
   std::string REError;