[clang-tools-extra] [clang-tidy]suggest use `std::span` as replacement of c array in C++20 for modernize-avoid-c-arrays (PR #108555)

[Congcong Cai via cfe-commits]

================
@@ -1,9 +1,9 @@
-// RUN: %check_clang_tidy %s modernize-avoid-c-arrays %t -- \
+// RUN: %check_clang_tidy -std=c++17 %s modernize-avoid-c-arrays %t -- \
 // RUN:  -config='{CheckOptions: { modernize-avoid-c-arrays.AllowStringArrays: 
true }}'
 
 const char name[] = "name";
 const char array[] = {'n', 'a', 'm', 'e', '\0'};
 // CHECK-MESSAGES: :[[@LINE-1]]:7: warning: do not declare C-style arrays, use 
std::array<> instead [modernize-avoid-c-arrays]
 
 void takeCharArray(const char name[]);
-// CHECK-MESSAGES: :[[@LINE-1]]:26: warning: do not declare C-style arrays, 
use std::array<> instead [modernize-avoid-c-arrays]
+// CHECK-MESSAGES: :[[@LINE-1]]:26: warning: do not declare C-style arrays, 
use std::vector<> instead [modernize-avoid-c-arrays]
----------------
HerrCai0907 wrote:

Actually not. How can you replace `void takeCharArray(const char name[]);` with 
`std::array` if you don't know the array size. In C++20, we can use `std::span` 
but for C++11, the ref of `std::vector` or maybe `std::string` (but I think 
this check should not introduce `std::string`) is the only choice.

https://github.com/llvm/llvm-project/pull/108555
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