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add empty variable slice at index 0

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This commit is contained in:
Folkert 2021-08-12 19:35:33 +02:00
parent a12114f0d8
commit e86cc22024
1 changed files with 17 additions and 2 deletions
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19
compiler/types/src/subs.rs
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@ -49,7 +49,7 @@ struct ErrorTypeState {
problems: Vec<crate::types::Problem>,
}
#[derive(Default, Clone)]
#[derive(Clone)]
pub struct Subs {
utable: UnificationTable<InPlace<Variable>>,
pub variables: Vec<Variable>,
@ -59,6 +59,21 @@ pub struct Subs {
pub variable_slices: Vec<VariableSubsSlice>,
}
impl Default for Subs {
fn default() -> Self {
Subs {
utable: Default::default(),
variables: Default::default(),
tag_names: Default::default(),
field_names: Default::default(),
record_fields: Default::default(),
// store an empty slice at the first position
// used for "TagOrFunction"
variable_slices: vec![VariableSubsSlice::default()],
}
}
}
/// A slice into the Vec<T> of subs
///
/// The starting position is a u32 which should be plenty
@ -883,7 +898,7 @@ pub enum Builtin {
EmptyRecord,
}
#[derive(Clone, Copy, Debug)]
#[derive(Clone, Copy, Debug, Default)]
pub struct VariableSubsSlice {
slice: SubsSlice<Variable>,
}