// Test the `rgb` function.

// Check the output.
[rgb: 0.0, 0.3, 0.7] [val: #004db3]

// Alpha channel.
[rgb: 1.0, 0.0, 0.0, 0.5]

// Value smaller than 0.0 and larger than 1.0
[rgb: -30, 15.5, 0.5]

// Missing blue component.
[rgb: 0, 1]

// Missing all components.
[rgb]

// error: 4:23-4:26 unknown function
// error: 10:7-10:10 should be between 0.0 and 1.0
// error: 10:12-10:16 should be between 0.0 and 1.0
// error: 13:7-13:11 missing argument: blue component
// error: 16:5-16:5 missing argument: red component
// error: 16:5-16:5 missing argument: green component
// error: 16:5-16:5 missing argument: blue component