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add clarifying comments to Constraints

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Folkert 2022-03-13 13:42:49 +01:00
parent 26d197c196
commit a9849a6ffc
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1 changed files with 11 additions and 2 deletions
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13
compiler/can/src/constraint.rs
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@ -353,6 +353,7 @@ impl Constraints {
I3: IntoIterator<Item = (Symbol, Loc<Type>)>,
I3::IntoIter: ExactSizeIterator,
{
// defs and ret constraint are stored consequtively, so we only need to store one index
let defs_and_ret_constraint = Index::new(self.constraints.len() as _);
self.constraints.push(defs_constraint);
@ -397,6 +398,7 @@ impl Constraints {
I2: IntoIterator<Item = (Symbol, Loc<Type>)>,
I2::IntoIter: ExactSizeIterator,
{
// defs and ret constraint are stored consequtively, so we only need to store one index
let defs_and_ret_constraint = Index::new(self.constraints.len() as _);
self.constraints.push(Constraint::True);
@ -454,6 +456,7 @@ impl Constraints {
region,
)
}
pub fn contains_save_the_environment(&self, constraint: &Constraint) -> bool {
match constraint {
Constraint::Eq(..) => false,
@ -499,7 +502,7 @@ impl Constraints {
}
}
static_assertions::assert_eq_size!([u8; 3 * 8], Constraint);
roc_error_macros::assert_sizeof_default!(Constraint, 3 * 8);
#[derive(Clone, PartialEq)]
pub enum Constraint {
@ -512,8 +515,14 @@ pub enum Constraint {
Index<PatternCategory>,
Region,
),
True, // Used for things that always unify, e.g. blanks and runtime errors
/// Used for things that always unify, e.g. blanks and runtime errors
True,
SaveTheEnvironment,
/// A Let constraint introduces symbols and their annotation at a certain level of nesting
///
/// The `Slice<Variable>` is used for imports where we manually put the Content into Subs
/// by copying from another module, but have to make sure that any variables we use to store
/// these contents are added to `Pool` at the correct rank
Let(Index<LetConstraint>, Slice<Variable>),
And(Slice<Constraint>),
/// Presence constraints