The Insert Character quick fix is available for missing syntax characters such as duplicate ;(semi-colon), ()(brackets), etc.
Supported: C#, VB.NET
If you miss to type a bracket, like in the following expression:
public void Foo(
JustCode will automatically underline the expression and report an error.
To insert missing syntax characters
Position the caret over the underlined error.
Press Alt+Enter. From the pop-up menu, select Insert 'the missing character'