pub const CONSOLE: ModuleSchema;Expand description
console: line-oriented output on two streams.
println and print write what the program produces; eprintln and
eprint write what it has to say about what it produces — a warning, a
progress line, a summary. With one stream the second kind has to go inside
the first, which is what puts a complaint about a malformed record in the
middle of the records.
Every operation takes a variadic String, which is why
console.println("a", "b") prints one line of two space-separated parts.
Bytes already handed to the terminal cannot be taken back, so all four are
irreversible writes.
All four are the console capability, and the two streams are not two
authorities: a program that may write to the terminal may write to the
terminal, and where a line lands is a question about the program’s output
rather than about what it was allowed to do. A host that means to capture
what a run produces and let its complaints through says so by handing
cove_runtime::host::Console two different writers, which is where that
choice belongs. ADR 0020 says why.