[llvm] Revert "[FileCheck] Fix parsing empty global and pseudo variable names" (PR #83657)

[Daniil Kovalev via llvm-commits]

https://github.com/kovdan01 created https://github.com/llvm/llvm-project/pull/83657

Reverts llvm/llvm-project#82595

See build failure https://lab.llvm.org/buildbot/#/builders/139/builds/60549

>From e1d58e480eb92b21ae4989b15bf625fc8383e50f Mon Sep 17 00:00:00 2001
From: Daniil Kovalev <kovdan01 at yandex.ru>
Date: Sat, 2 Mar 2024 07:20:30 +0300
Subject: [PATCH] Revert "[FileCheck] Fix parsing empty global and pseudo
 variable names (#82595)"

This reverts commit aab3d13179dc5a37465a0e6fbf1b9369a4e6e50f.
---
 llvm/lib/FileCheck/FileCheck.cpp            |  6 ----
 llvm/test/FileCheck/empty-variable-name.txt | 32 ---------------------
 2 files changed, 38 deletions(-)
 delete mode 100644 llvm/test/FileCheck/empty-variable-name.txt

diff --git a/llvm/lib/FileCheck/FileCheck.cpp b/llvm/lib/FileCheck/FileCheck.cpp
index 8f80a69c4abd3a..6d3a2b9cf46f7c 100644
--- a/llvm/lib/FileCheck/FileCheck.cpp
+++ b/llvm/lib/FileCheck/FileCheck.cpp
@@ -297,12 +297,6 @@ Pattern::parseVariable(StringRef &Str, const SourceMgr &SM) {
   if (Str[0] == '$' || IsPseudo)
     ++I;
 
-  if (I == Str.size())
-    return ErrorDiagnostic::get(SM, Str.slice(I, StringRef::npos),
-                                StringRef("empty ") +
-                                    (IsPseudo ? "pseudo " : "global ") +
-                                    "variable name");
-
   if (!isValidVarNameStart(Str[I++]))
     return ErrorDiagnostic::get(SM, Str, "invalid variable name");
 
diff --git a/llvm/test/FileCheck/empty-variable-name.txt b/llvm/test/FileCheck/empty-variable-name.txt
deleted file mode 100644
index 29c6317e6bb17e..00000000000000
--- a/llvm/test/FileCheck/empty-variable-name.txt
+++ /dev/null
@@ -1,32 +0,0 @@
-a
-
-; RUN: not FileCheck -input-file %s %s 2>&1 | \
-; RUN:   FileCheck -check-prefix CHECK-ERROR -DDIR=%S \
-; RUN:   --match-full-lines --strict-whitespace %s
-
-; CHECK:        a[[]]
-; CHECK-ERROR:[[DIR]]{{/|\\}}empty-variable-name.txt:7:13: error: empty variable name
-; CHECK-ERROR-NEXT:; CHECK: a{{\[\[\]\]}}
-;      CHECK-ERROR-NEXT:            ^
-
-b
-
-; RUN: not FileCheck -input-file %s -check-prefix CHECK-PSEUDO %s 2>&1 | \
-; RUN:   FileCheck -check-prefix CHECK-ERROR-PSEUDO -DDIR=%S \
-; RUN:   --match-full-lines --strict-whitespace %s
-
-; CHECK-PSEUDO: b[[@]]
-; CHECK-ERROR-PSEUDO:[[DIR]]{{/|\\}}empty-variable-name.txt:18:21: error: empty pseudo variable name
-; CHECK-ERROR-PSEUDO-NEXT:; CHECK-PSEUDO: b{{\[\[@\]\]}}
-;      CHECK-ERROR-PSEUDO-NEXT:                    ^
-
-c
-
-; RUN: not FileCheck -input-file %s -check-prefix CHECK-GLOBAL %s 2>&1 | \
-; RUN:   FileCheck -check-prefix CHECK-ERROR-GLOBAL -DDIR=%S \
-; RUN:   --match-full-lines --strict-whitespace %s
-
-; CHECK-GLOBAL: c[[$]]
-; CHECK-ERROR-GLOBAL:[[DIR]]{{/|\\}}empty-variable-name.txt:29:21: error: empty global variable name
-; CHECK-ERROR-GLOBAL-NEXT:; CHECK-GLOBAL: c{{\[\[\$\]\]}}
-;       CHECK-ERROR-GLOBAL-NEXT:                    ^