Synopsis Concatenate two strings.
Syntax Exp1 + Exp2
Exp1 Exp2 Exp1 + Exp2
str str str
Description Concatenates the string values of Exp1 and Exp2.

Note that to concatenate other types of values into a string, you can use String interpolation.
rascal>"abc" + "def";
str: "abcdef"
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