Add `console.assert_eq` and `console.assert_neq`.
Remove `console.log` and `console.error`.
Remove the format string grammar, since it was only used for console print
calls, which have been removed.
This matches #2023.
This is to match the recent introduction of the `@program` annotation for
external functions (i.e. functions that may be called externally, passing to
them inputs through the input files).
This PR adds not just that annotation, but a more general notion of annotation
as a new kind of token of the form `@<identifier>`, and with the ability to
precede each function declaration with zero or more such annotations.
The fact that it has been added as a token to the lexical grammar, means that
there cannot be any whitespace or comments between the `@` and the identifier.
If that is undesired, we can add it to the syntactic grammar instead, defining
an annotation as consisting of the (new) symbol token `@` followed by an
identifier token.
We can of course extend annotations with arguments at some point, if needed.
This adds tuple types, tuple expressions (which build tuples from components),
and tuple component expressions (which access tuple components).
Based on previous discussions on this topic, 1-tuples are excluded. This
exclusion is done at the grammar level, since it is the kind of requirement that
is easily captured in a context-free grammar.
Based on a recent discussion on Slack, and on some related slight terminological
changes in the documentation of the Aleo instructions, this commit similarly
improves the Leo nomenclature for expressions involving the logical operators.
The attribute 'bitwise' for `&` and `|` and `^` has been dropped, since the
operations also operate on booleans besides integers.
Given that the operation and method names `or` and `xor` for inclusive and
exclusive disjunctions (as opposed to `ior` and `xor`), the unqualified
'disjunction' now refers to the inclusive one.
The non-strict `&&` and `||` are now called 'conditional' (as done in other
languages), and thus the ternary one has been expanded to 'conditional ternary'.
This does not change the Leo language; it just improves the nomenclature derived
from the grammar.
