error CS9176: There is no target type for the collection expression

[Nefcanto]

Description

Consider this code:

var names = [
    "John",
    "David"
];

We get this error for it:

error CS9176: There is no target type for the collection expression

The target type is clear. It's an array of strings.

Reproduction Steps

1- Create a simple console app
2- Add this code to it:

var names = [
    "John",
    "David"
];

3- Compile

Expected behavior

No error should be thrown. The program should compile. The variable is an array of strings. This is the universal behavior in almost any language, including JavaScript and Python.

Actual behavior

It does not compile. We need to change the var into string[] to make it compile which is unnecessary.

Regression?

No response

Known Workarounds

No response

Configuration

No response

Other information

No response

[huoyaoyuan]

This is a C# language question and should go to https://github.com/dotnet/csharplang/discussions. The natural type of collection expression is still being designed at https://github.com/dotnet/csharplang/blob/main/proposals/collection-expressions-next.md#natural-type and dotnet/csharplang#7913.

This is the universal behavior in almost any language, including JavaScript and Python.

It is not. JavaScript and Python do not have different collection types that provide different performance characteristics. There's only one weakly typed "array list".
Collection expression is more like std::initializer_list in C++, that can be accepted by different collection types.

Closing as not a runtime issue.