E2272 Cannot use reserved unit name '%s' (Delphi)

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An attempt has been made to use one of the reserved unit names, such as System, as the name of a user-created unit.

The names in the following list are currently reserved by the compiler.

• System
• SysInit

unit System;
interface
implementation
begin
end.

The name of the unit in this example is illegal because it is reserved for use by the compiler.

unit MySystem;
interface
implementation
begin
end.

The only solution to this problem is to use a different name for the unit.