[llvm-bugs] [Bug 44464] New: Assertion `Changes[i - 1].OriginalWhitespaceRange.getBegin() != C.OriginalWhitespaceRange.getBegin() && "Generating two replacements for the same location"' failed.

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=44464

            Bug ID: 44464
           Summary: Assertion `Changes[i -
                    1].OriginalWhitespaceRange.getBegin() !=
                    C.OriginalWhitespaceRange.getBegin() && "Generating
                    two replacements for the same location"' failed.
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Formatter
          Assignee: unassignedclangbugs at nondot.org
          Reporter: pablomg+llvm at eskapa.be
                CC: djasper at google.com, klimek at google.com,
                    llvm-bugs at lists.llvm.org

Created attachment 22989
  --> https://bugs.llvm.org/attachment.cgi?id=22989&action=edit
Stack trace

While blindly applying clang-format on all .cpp files inside the llvm-project
tree, I stumbled upon this assertion fail.

The fail appears while running clang-format on the following comments in
clang/test/CodeGenCXX/constructor-destructor-return-this.cpp:
//RUN: %clang_cc1 %s -emit-llvm -o - -triple=i686-unknown-linux| FileCheck
--check-prefix=CHECKGEN %s
//RUN: %clang_cc1 %s -emit-llvm -o - -triple=thumbv7-apple-ios6.0 -target-abi
apcs-gnu | FileCheck --check-prefix=CHECKARM %s
//RUN: %clang_cc1 %s -emit-llvm -o - -triple=thumbv7-apple-ios5.0 -target-abi
apcs-gnu | FileCheck --check-prefix=CHECKIOS5 %s
//RUN: %clang_cc1 %s -emit-llvm -o - -triple=wasm32-unknown-unknown \
//RUN:   | FileCheck --check-prefix=CHECKARM %s
//RUN: %clang_cc1 %s -emit-llvm -o - -triple=x86_64-unknown-fuchsia | FileCheck
--check-prefix=CHECKFUCHSIA %s
//RUN: %clang_cc1 %s -emit-llvm -o - -triple=aarch64-unknown-fuchsia |
FileCheck --check-prefix=CHECKFUCHSIA %s
//RUN: %clang_cc1 %s -emit-llvm -o - -triple=i386-pc-win32 -fno-rtti |
FileCheck --check-prefix=CHECKMS %s

I can avoid the assertion fail either by setting the column limit to 0 (but
setting it to 500 doesn't work) or by inserting an empty line after each
comment line. This issue didn't exist on clang-format 9.

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