Errors

While compiling

The compiler shows where each mistake is and what it expected:

error: expected int, got string
 --> main.cfl:2:6
  |
2 | hp = "full"
  |      ^^^^^^ this is string

error: couldn't compile main (1 error)

When a name is almost right, it says so:

error: `scroe` doesn't exist
 --> main.cfl:2:7
  |
2 | print(scroe)
  |       ^^^^^
   = did you mean `score`?

It keeps going after a mistake and reports as many as it can find at once. corfli check shows them without building.

A few things stop a program with a message on stderr and exit code 1:

message	when
`dividing by zero`	`/` or `%` by 0, in every build
`this value doesn't fit in byte (0 to 255)`	a conversion like `byte(x)` gets a value that's too big or too small
`this isn't a valid char`	char arithmetic goes past the last Unicode letter
`the result doesn't fit in int (...)`	a number overflows, in a debug build only
`out of memory`	the system has no memory left

Each message ends with the file, line and column:

error: dividing by zero
  --> main.cfl:3:7

In a release build an overflowing number wraps around instead; see Operators.