Error Reporting

For now, only the Tamsin interpreter is expected to pass these tests.

Also, these tests expose some details about how Falderal creates temp files. Boo!

-> Tests for functionality "Intepret Tamsin program"

When a scanning error occurs in a Tamsin source, the filename, line number, and column number are reported.

| hello = "h".
|     %
? expected identifiable character but found '%' at line 2, column 5 in '/tmp/tmp

When a parsing error occurs in a Tamsin source, the filename, line number, and column number are reported.

| slough = "h" & ("o" | "p").
| maidenhead = "h" & ("o" | "p").
| reading = "h" ("o" | "p").
? expected '.' but found '(' at line 3, column 16 in '/tmp/tmp

| pasta = "h" & «hop() & "p".
? expected '>>' but found '&' at line 1, column 22 in '/tmp/tmp

| pasta = "h" & «hop()
? expected '>>' but found EOF at line 1, column 22 in '/tmp/tmp

When a scanning error occurs in the input to a Tamsin program, the filename, line number, and column number are reported.

| main = "h" & "o" & "x".
+ hop
? expected 'x' but found 'p' at line 1, column 3 in '<stdin>'

| main = "h" & "o" & {"\n"} & "0" & "x".
+ ho
+ 
+ 0p
? expected 'x' but found 'p' at line 3, column 2 in '<stdin>'

| main = "h" & "o" & "x".
+ ho
? expected 'x' but found EOF at line 1, column 3 in '<stdin>'

| main = "h" & "o" & $:eof.
+ hox
? expected EOF but found 'x' at line 1, column 3 in '<stdin>'

| main = "h" & "o" & $:any.
+ ho
? expected any token but found EOF at line 1, column 3 in '<stdin>'

| main = "h" & "o" & $:alnum.
+ ho&
? expected alphanumeric but found '&' at line 1, column 3 in '<stdin>'

| main = "h" & "o" & $:upper.
+ hod
? expected uppercase but found 'd' at line 1, column 3 in '<stdin>'

| main = "h" & "o" & $:startswith('f').
+ hod
? expected 'f...' but found 'd' at line 1, column 3 in '<stdin>'

| main = "h" & "o" & (! "n").
+ hon
? expected anything else but found 'n' at line 1, column 3 in '<stdin>'