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11.3.3 Expressions

An expression is either a string expression or a string list expression.

A string expression is either a simple string expression or a compound string expression.

A simple string expression is one of the following:

A compound string expression is a concatenation of string expressions, using the operator "&"

            Path & "/" & File_Name & ".ads"

A string list expression is either a simple string list expression or a compound string list expression.

A simple string list expression is one of the following:

A compound string list expression is the concatenation (using "&") of a simple string list expression and an expression. Note that each term in a compound string list expression, except the first, may be either a string expression or a string list expression.

        File_Name_List := () & File_Name; --  One string in this list
        Extended_File_Name_List := File_Name_List & (File_Name & ".orig");
        --  Two strings
        Big_List := File_Name_List & Extended_File_Name_List;
        --  Concatenation of two string lists: three strings
        Illegal_List := "gnat.adc" & Extended_File_Name_List;
        --  Illegal: must start with a string list