FALSE NEGATIVE: `unreadVariable` misses an unused lambda object

[Rodri]

Hi, I found a false negative in Cppcheck 2.21.0 and 2.22 dev when a local lambda object is initialized but never read.

Affected tool

Cppcheck 2.21.0; also reproduced with Cppcheck 2.22 dev

Affected checker

Cppcheck unreadVariable

Minimal reproducer

void test(int value) {
  auto callback = [value] {};
}

Reproduction command

cppcheck --version
cppcheck --enable=style --inconclusive --std=c++17 --checkers-report=checkers.txt --template='{file}:{line}:{column}: [{id}] {message}' cppcheck-unreadvariable-fn-lambda.cpp

Current behavior

Cppcheck produces no unreadVariable, unusedVariable, or redundantAssignment diagnostic.

Expected behavior

Cppcheck should report line 2 because the value assigned to callback is never read.

[CHR]

See https://trac.cppcheck.net/ticket/12957