Commit the expected output of the tests.

demos/calc-syntax-errors/calc01.exp

+File "<standard input>", line 1, characters 2-3:
+Syntax error after '+' and before '+'.
+After an arithmetic operator, an expression is expected.

demos/calc-syntax-errors/calc02.exp

+File "<standard input>", line 1, characters 5-6:
+Syntax error after ')' and before '('.
+I have read a well-formed expression.
+I am now expecting either an arithmetic operator or the end of the input.

demos/calc-syntax-errors/calc04.exp

+File "<standard input>", line 1, characters 1-2:
+Syntax error after '(' and before '+'.
+After an opening parenthesis, an expression is expected.

demos/calc-syntax-errors/calc05.exp

+File "<standard input>", line 1, characters 0-1:
+Syntax error before ')'.
+At the beginning, an expression is expected.