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Merge pull request #4209 from roc-lang/impl-tag-discriminant

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Derive `Hash` implementations for tag unions
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Ayaz 2022-10-10 22:23:05 -05:00 • committed by GitHub
commit 83b64c4fb3
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13 changed files with 844 additions and 106 deletions
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16
crates/compiler/derive_key/src/encoding.rs
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@ -5,7 +5,7 @@ use roc_module::{
use roc_types::subs::{Content, FlatType, GetSubsSlice, Subs, Variable};
use crate::{
util::{check_derivable_ext_var, debug_name_record},
util::{check_derivable_ext_var, debug_name_record, debug_name_tag},
DeriveError,
};
@ -32,19 +32,7 @@ impl FlatEncodableKey {
FlatEncodableKey::Set() => "set".to_string(),
FlatEncodableKey::Dict() => "dict".to_string(),
FlatEncodableKey::Record(fields) => debug_name_record(fields),
FlatEncodableKey::TagUnion(tags) => {
let mut str = String::from('[');
tags.iter().enumerate().for_each(|(i, (tag, arity))| {
if i > 0 {
str.push(',');
}
str.push_str(tag.0.as_str());
str.push(' ');
str.push_str(&arity.to_string());
});
str.push(']');
str
}
FlatEncodableKey::TagUnion(tags) => debug_name_tag(tags),
}
}
}