Declaring and initializing a vector in C++ 17 - c++

Question

This code doesn't compile in VS Code for Mac.
#include <iostream>
#include <string>
#include <vector>
#include <map>
using std::vector;
using std::cout;
int main()
{
std::vector<int> v{23, 52, 9};
for (int const& i : v)
{
std::cout << "Hello " << i << "!\n";
}
}
Error:
hello.cpp:11:23: error: expected ';' at end of declaration
std::vector<int> v{23, 52, 9};
My c_cpp_properties.json suggests I'm using C++ 17.
This is the output of tasks.json:
{
"tasks": [
{
"type": "cppbuild",
"label": "C/C++: clang++ build active file",
"command": "/usr/bin/clang++",
"args": [
"-fcolor-diagnostics",
"-fansi-escape-codes",
"-g",
"${file}",
"-o",
"${fileDirname}/${fileBasenameNoExtension}"
],
"options": {
"cwd": "${fileDirname}"
},
"problemMatcher": [
"$gcc"
],
"group": {
"kind": "build",
"isDefault": true
},
"detail": "Task generated by Debugger."
},
{
"type": "cppbuild",
"label": "C/C++: clang++ build active file",
"command": "/usr/bin/clang++",
"args": [
"-fcolor-diagnostics",
"-fansi-escape-codes",
"-g",
"${file}",
"-o",
"${fileDirname}/${fileBasenameNoExtension}"
],
"options": {
"cwd": "${fileDirname}"
},
"problemMatcher": [
"$gcc"
],
"group": "build",
"detail": "compiler: /usr/bin/clang++"
}
],
"version": "2.0.0"
}
It is expecting me to not supply initial members of the array/list. Really weird. Same code works if I use the same declaration without initializing it, but using v.push_back().