Spaces between type and variable name in IIFE lambda in brace init removed by formatter

[w-m]

Bugzilla Link	44947
Version	9.0
OS	Linux
CC	@w-m,@mydeveloperday

Extended Description

The following code

int foo {[]() {
  int bar{ 0 };
  return 0;
}()};

is formatted into

int foo{ []() {
  intbar{ 0 };
  return 0;
}() };

by clang-format-9 when using -style="{AlignConsecutiveDeclarations: true, Cpp11BracedListStyle: false}".

The resulting code no longer compiles - note the missing space between int and the variable name.

Changing either formatting option will fix the problem, it's the combination that leads to the erroneous output.

The code is also correctly formatted if the outer braces (initialization of foo) are replaced by a = assignment.

I don't have a later clang-format version than 9 installed locally, but trying this code snippet in https://zed0.co.uk/clang-format-configurator with 10.0.0+b452de0 and these two formatting options, the output suddenly gets blank (-> crash?).

[mydeveloperday]

The crash is actually an assertion

Assertion failed: Shift >= 0, file C:\clang\llvm-project\clang\lib\Format\WhitespaceManager.cpp, line 295

[mkurdej]

Broken between v4 and v5:

"d:\Program Files\LLVM-4.0.1\bin\clang-format.exe" -style=file test.cpp
const auto result{ []() {
  const auto something = 1;
  return 2;
} };

int foo{ []() {
  int bar{ 0 };
  return 0;
}() };

"d:\Program Files\LLVM-5.0.2\bin\clang-format.exe" -style=file test.cpp
const auto result{ []() {
  const autosomething = 1;
  return 2;
} };

int foo{ []() {
  intbar{ 0 };
  return 0;
}() };

[mkurdej]

Revision URI: https://reviews.llvm.org/D119419