* Assigning a string to the [`FixedString`](https://docs.unity3d.com/Packages/com.unity.collections@2.2/api/Unity.Collections.FixedString.html) structs that `Unity.Collections` provides, for example [`FixedString128Bytes`](https://docs.unity3d.com/Packages/com.unity.collections@2.2/api/Unity.Collections.FixedString128Bytes.html).
* The [`System.Runtime.CompilerServices`](https://docs.microsoft.com/en-us/dotnet/api/system.runtime.compilerservices?view=net-6.0) attributes `[CallerLineNumber]`, `[CallerMemberName]`, and `[CallerFilePath]` on arguments to Burst functions. However, you can only pass the strings directly to calls to `Debug.Log`.
A string can be either:
* A string literal. For example: `"This is a string literal"`.
* An interpolated string using `$"This is an integer {value}` or using `string.Format`, where the string to format is also a string literal.
For example, Burst supports the following constructions:
* Logging with a string literal:
```c#
Debug.Log("This a string literal");
```
* Logging using string interpolation:
```c#
int value = 256;
Debug.Log($"This is an integer value {value}");
```
This is the same as using `string.Format` directly:
```c#
int value = 256;
Debug.Log(string.Format("This is an integer value {0}", value));
```
## Supported `Debug.Log` methods
Burst supports the following [`Debug.Log`](https://docs.unity3d.com/ScriptReference/Debug.Log.html) methods:
*`Debug.Log(object)`
*`Debug.LogWarning(object)`
*`Debug.LogError(object)`
## String interpolation support
String interpolation has the following restrictions:
* The string must be a string literal
* Burst supports the following `string.Format` methods:
*`string.Format(string, object)`
*`string.Format(string, object, object)`
*`string.Format(string, object, object, object)`
*`string.Format(string, object[])`. Use this for a string interpolation that contains more than three arguments, for example `$"{arg1} {arg2} {arg3} {arg4} {arg5}"`. In this case, the `object[]` array needs to be a constant size and no arguments should involve control flows (for example, `$"This is a {(cond ? arg1 : arg2)}"`).
* The string must only use value types
* The string must take only built-in type arguments:
For more information, refer to the .NET documentation on [String interpolation](https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/tokens/interpolated) and [Standard numeric format strings](https://docs.microsoft.com/en-us/dotnet/standard/base-types/standard-numeric-format-strings).
You can pass a managed `string` literal or an interpolated string directly to `Debug.Log`, but you can't pass a string to a user method or use them as fields in a struct. To pass around or store strings, use one of the [`FixedString`](https://docs.unity3d.com/Packages/com.unity.collections@1.2/api/Unity.Collections.FixedString.html) structs in the `Unity.Collections` package:
