Version: 2018.2 (switch to 2018.3b or 2017.4)
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Generic Functions

The Unity Scripting API Reference documentation lists some functions (for example, the various GetComponent functions) with a variant that has a letter T or a type name in angle brackets after the function name:

//C#
void FuncName<T>();

These are generic functions. You can use them to specify the types of parameters and/or the return type when you call the function.

// The type is correctly inferred because it is defined in the function call
var obj = GetComponent<Rigidbody>();

In C#, it can save a lot of keystrokes and cast; for example:

Rigidbody rb= (Rigidbody) go.GetComponent(typeof(Rigidbody));

Compared to:

Rigidbody rb = go.GetComponent<Rigidbody>();

Any function that has a generic variant listed on its Scripting API Reference documentation page allows this special calling syntax.

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Stable scripting runtime: known limitations
Scripting restrictions