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Merge branch 'main' into newline-assignment

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Lucas 2023-03-16 15:30:55 -04:00 committed by GitHub
parent 20f5baffa7 b2f3b66a96
commit fab6d56bf2
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8 changed files with 246 additions and 261 deletions
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1
CHANGELOG.md
View File

@ -18,6 +18,7 @@
- **aiken-lang**: `|>` operator can now be formatted as a single (short) line or forced over multiline in a flexible manner
- **aiken-lang**: the compiler now provides better feedback for type holes (i.e. `_`) in type annotations
- **aiken-lang**: assignment and clause guard are now always formatted on a new line
- **aiken-lang**: unused let-bindings are now fully removed from generated code and discarded unused let-binding now raise a warning
## [v0.0.29] - 2023-MM-DD

11
crates/aiken-lang/src/ast.rs
View File

@ -795,14 +795,20 @@ pub enum Pattern<Constructor, Type> {
},
/// The creation of a variable.
/// e.g. `assert [this_is_a_var, .._] = x`
/// e.g. `expect [this_is_a_var, .._] = x`
/// e.g. `let foo = 42`
Var {
location: Span,
name: String,
},
/// A name given to a sub-pattern using the `as` keyword.
/// e.g. `assert (1, [_, _] as the_list) = x`
///
/// ```aiken
/// when foo is {
/// [_, _] as the_list -> ...
/// }
/// ```
Assign {
name: String,
location: Span,
@ -849,7 +855,6 @@ impl<A, B> Pattern<A, B> {
| Pattern::List { location, .. }
| Pattern::Discard { location, .. }
| Pattern::Tuple { location, .. }
// | Pattern::Concatenate { location, .. }
| Pattern::Constructor { location, .. } => *location,
}
}

58
crates/aiken-lang/src/tests/check.rs
View File

@ -1,6 +1,8 @@
use crate::{
ast::{ModuleKind, Tracing, TypedModule, UntypedModule},
builtins, parser,
ast::{Definition, ModuleKind, Tracing, TypedModule, UntypedModule},
builtins,
expr::TypedExpr,
parser,
tipo::error::{Error, Warning},
IdGenerator,
};
@ -319,3 +321,55 @@ fn utf8_hex_literal_warning() {
Warning::Utf8ByteArrayIsValidHexString { .. }
))
}
#[test]
fn discarded_let_bindings() {
let source_code = r#"
fn foo() {
let result = when 42 is {
1 -> {
let unused = "foo"
Void
}
_ -> {
Void
}
}
let _ = "foo"
result
}
"#;
let (warnings, ast) = check(parse(source_code)).unwrap();
assert!(matches!(warnings[0], Warning::UnusedVariable { ref name, .. } if name == "unused"));
assert!(matches!(warnings[1], Warning::UnusedVariable { ref name, .. } if name == "_"));
// Controls that unused let-bindings have been erased from the transformed AST.
match ast.definitions.first() {
Some(Definition::Fn(def)) => match &def.body {
TypedExpr::Sequence { expressions, .. } => {
assert_eq!(expressions.len(), 2);
assert!(
matches!(expressions[1], TypedExpr::Var { .. }),
"last expression isn't return variable"
);
match &expressions[0] {
TypedExpr::Assignment { value, .. } => match **value {
TypedExpr::When { ref clauses, .. } => {
assert!(
matches!(clauses[0].then, TypedExpr::Sequence { ref expressions, ..} if expressions.len() == 1)
)
}
_ => unreachable!("first expression isn't when/is"),
},
_ => unreachable!("first expression isn't assignment"),
}
}
_ => unreachable!("body isn't a Sequence"),
},
_ => unreachable!("ast isn't a Fn"),
}
}

24
crates/aiken-lang/src/tipo/error.rs
View File

@ -254,7 +254,7 @@ You can use '{discard}' and numbers to distinguish between similar names.
#[error("I found a discarded expression not bound to a variable.\n")]
#[diagnostic(code("implicit_discard"))]
#[diagnostic(help(
"A function can contain a sequence of expressions. However, any expression but the last one must be assign to a variable using the {keyword_let} keyword. If you really wish to discard an expression that is unused, you can assign it to '{discard}'.",
"A function can contain a sequence of expressions. However, any expression but the last one must be assigned to a variable using the {keyword_let} keyword. If you really wish to discard an expression that is unused, you can assign it to '{discard}'.",
keyword_let = "let".if_supports_color(Stdout, |s| s.yellow()),
discard = "_".if_supports_color(Stdout, |s| s.yellow())
))]
@ -1337,13 +1337,6 @@ pub enum Warning {
name: String,
},
#[error("I found a literal that is unused.\n")]
#[diagnostic(code("unused::literal"))]
UnusedLiteral {
#[label]
location: Span,
},
#[error(
"I found an unused private function: '{}'.\n",
name.if_supports_color(Stderr, |s| s.purple()),
@ -1389,9 +1382,18 @@ pub enum Warning {
},
#[error("I came across an unused variable.\n")]
#[diagnostic(help(
"No big deal, but you might want to remove it to get rid of that warning."
))]
#[diagnostic(help("{}", formatdoc! {
r#"No big deal, but you might want to remove it to get rid of that warning.
You should also know that, unlike in typical imperative languages, unused let-bindings are {fully_ignored} in Aiken.
They will not produce any side-effect (such as error calls). Programs with or without unused variables are semantically equivalent.
If you do want to enforce some side-effects, use {keyword_expect} instead of {keyword_let}.
"#,
fully_ignored = "fully_ignored".if_supports_color(Stderr, |s| s.bold()),
keyword_expect = "expect".if_supports_color(Stderr, |s| s.yellow()),
keyword_let = "let".if_supports_color(Stderr, |s| s.yellow()),
}))]
#[diagnostic(code("unused::variable"))]
UnusedVariable {
#[label("unused")]

90
crates/aiken-lang/src/tipo/expr.rs
View File

@ -912,8 +912,7 @@ impl<'a, 'b> ExprTyper<'a, 'b> {
annotation: &Option<Annotation>,
location: Span,
) -> Result<TypedExpr, Error> {
let typed_value =
self.in_new_scope(|value_typer| value_typer.infer(untyped_value.clone()))?;
let typed_value = self.infer(untyped_value.clone())?;
let mut value_typ = typed_value.tipo();
let value_is_data = value_typ.is_data();
@ -938,6 +937,7 @@ impl<'a, 'b> ExprTyper<'a, 'b> {
untyped_pattern.clone(),
value_typ.clone(),
Some(ann_typ),
kind.is_let(),
)?
} else {
if value_is_data && !untyped_pattern.is_var() && !untyped_pattern.is_discard() {
@ -963,13 +963,15 @@ impl<'a, 'b> ExprTyper<'a, 'b> {
untyped_pattern.clone(),
value_typ.clone(),
None,
kind.is_let(),
)?
};
// We currently only do limited exhaustiveness checking of custom types
// at the top level of patterns.
// Do not perform exhaustiveness checking if user explicitly used `assert`.
if kind != AssignmentKind::Expect {
match kind {
AssignmentKind::Let => {
if let Err(unmatched) = self.environment.check_exhaustiveness(
vec![pattern.clone()],
collapse_links(value_typ.clone()),
@ -981,17 +983,19 @@ impl<'a, 'b> ExprTyper<'a, 'b> {
is_let: true,
});
}
} else if !value_is_data
&& !value_typ.is_list()
&& self
}
AssignmentKind::Expect => {
let is_exaustive_pattern = self
.environment
.check_exhaustiveness(
vec![pattern.clone()],
collapse_links(value_typ.clone()),
location,
)
.is_ok()
{
.is_ok();
if !value_is_data && !value_typ.is_list() && is_exaustive_pattern {
self.environment
.warnings
.push(Warning::SingleConstructorExpect {
@ -1008,7 +1012,9 @@ impl<'a, 'b> ExprTyper<'a, 'b> {
kind: AssignmentKind::Let,
annotation: None,
},
})
});
}
}
}
Ok(TypedExpr::Assignment {
@ -1097,19 +1103,14 @@ impl<'a, 'b> ExprTyper<'a, 'b> {
location,
} = clause;
let (guard, then, typed_pattern, typed_alternatives) =
self.in_new_scope(|clause_typer| {
let (guard, then, typed_pattern, typed_alternatives) = self.in_new_scope(|scope| {
// Check the types
let (typed_pattern, typed_alternatives) = clause_typer.infer_clause_pattern(
pattern,
alternative_patterns,
subjects,
&location,
)?;
let (typed_pattern, typed_alternatives) =
scope.infer_clause_pattern(pattern, alternative_patterns, subjects, &location)?;
let guard = clause_typer.infer_optional_clause_guard(guard)?;
let guard = scope.infer_optional_clause_guard(guard)?;
let then = clause_typer.infer(then)?;
let then = scope.infer(then)?;
Ok::<_, Error>((guard, then, typed_pattern, typed_alternatives))
})?;
@ -1416,7 +1417,7 @@ impl<'a, 'b> ExprTyper<'a, 'b> {
false,
)?;
let body = self.in_new_scope(|body_typer| body_typer.infer(first.body.clone()))?;
let body = self.infer(first.body.clone())?;
let tipo = body.tipo();
@ -1436,7 +1437,7 @@ impl<'a, 'b> ExprTyper<'a, 'b> {
false,
)?;
let body = self.in_new_scope(|body_typer| body_typer.infer(branch.body.clone()))?;
let body = self.infer(branch.body.clone())?;
self.unify(
tipo.clone(),
@ -1452,7 +1453,7 @@ impl<'a, 'b> ExprTyper<'a, 'b> {
});
}
let typed_final_else = self.in_new_scope(|body_typer| body_typer.infer(final_else))?;
let typed_final_else = self.infer(final_else)?;
self.unify(
tipo.clone(),
@ -1502,11 +1503,10 @@ impl<'a, 'b> ExprTyper<'a, 'b> {
) -> Result<(Vec<TypedArg>, TypedExpr), Error> {
self.assert_no_assignment(&body)?;
let (body_rigid_names, body_infer) = self.in_new_scope(|body_typer| {
for (arg, t) in args.iter().zip(args.iter().map(|arg| arg.tipo.clone())) {
match &arg.arg_name {
ArgName::Named { name, .. } => {
body_typer.environment.insert_variable(
self.environment.insert_variable(
name.to_string(),
ValueConstructorVariant::LocalVariable {
location: arg.location,
@ -1514,7 +1514,7 @@ impl<'a, 'b> ExprTyper<'a, 'b> {
t,
);
body_typer.environment.init_usage(
self.environment.init_usage(
name.to_string(),
EntityKind::Variable,
arg.location,
@ -1524,8 +1524,7 @@ impl<'a, 'b> ExprTyper<'a, 'b> {
};
}
(body_typer.hydrator.rigid_names(), body_typer.infer(body))
});
let (body_rigid_names, body_infer) = (self.hydrator.rigid_names(), self.infer(body));
let body = body_infer.map_err(|e| e.with_unify_error_rigid_names(&body_rigid_names))?;
@ -1620,6 +1619,7 @@ impl<'a, 'b> ExprTyper<'a, 'b> {
}
fn infer_seq(&mut self, location: Span, untyped: Vec<UntypedExpr>) -> Result<TypedExpr, Error> {
let sequence = self.in_new_scope(|scope| {
let count = untyped.len();
let mut expressions = Vec::with_capacity(count);
@ -1628,19 +1628,43 @@ impl<'a, 'b> ExprTyper<'a, 'b> {
match i.cmp(&(count - 1)) {
// When the expression is the last in a sequence, we enforce it is NOT
// an assignment (kind of treat assignments like statements).
Ordering::Equal => self.assert_no_assignment(&expression)?,
Ordering::Equal => scope.assert_no_assignment(&expression)?,
// This isn't the final expression in the sequence, so it *must*
// be a let-binding; we do not allow anything else.
Ordering::Less => self.assert_assignment(&expression)?,
Ordering::Less => scope.assert_assignment(&expression)?,
// Can't actually happen
Ordering::Greater => (),
}
expressions.push(self.infer(expression)?);
expressions.push(scope.infer(expression)?);
}
Ok(expressions)
})?;
let unused = self
.environment
.warnings
.iter()
.filter_map(|w| match w {
Warning::UnusedVariable { location, .. } => Some(*location),
_ => None,
})
.collect::<Vec<_>>();
let expressions = sequence
.into_iter()
.filter(|expr| {
if let TypedExpr::Assignment { pattern, .. } = expr {
!unused.contains(&pattern.location())
} else {
true
}
})
.collect::<Vec<_>>();
Ok(TypedExpr::Sequence {
location,
expressions,
@ -1869,11 +1893,7 @@ impl<'a, 'b> ExprTyper<'a, 'b> {
let return_type = self.new_unbound_var();
for subject in subjects {
let subject = self.in_new_scope(|subject_typer| {
let subject = subject_typer.infer(subject)?;
Ok::<_, Error>(subject)
})?;
let subject = self.infer(subject)?;
subject_types.push(subject.tipo());

114
crates/aiken-lang/src/tipo/pattern.rs
View File

@ -145,79 +145,12 @@ impl<'a, 'b> PatternTyper<'a, 'b> {
// Unify each pattern in the multi-pattern with the corresponding subject
let mut typed_multi = Vec::with_capacity(multi_pattern.len());
for (pattern, subject_type) in multi_pattern.into_iter().zip(subjects) {
let pattern = self.unify(pattern, subject_type.clone(), None)?;
let pattern = self.unify(pattern, subject_type.clone(), None, false)?;
typed_multi.push(pattern);
}
Ok(typed_multi)
}
// fn infer_pattern_bit_string(
// &mut self,
// mut segments: Vec<UntypedPatternBitStringSegment>,
// location: Span,
// ) -> Result<TypedPattern, Error> {
// let last_segment = segments.pop();
// let mut typed_segments: Vec<_> = segments
// .into_iter()
// .map(|s| self.infer_pattern_segment(s, false))
// .try_collect()?;
// if let Some(s) = last_segment {
// let typed_last_segment = self.infer_pattern_segment(s, true)?;
// typed_segments.push(typed_last_segment)
// }
// Ok(TypedPattern::BitString {
// location,
// segments: typed_segments,
// })
// }
// fn infer_pattern_segment(
// &mut self,
// segment: UntypedPatternBitStringSegment,
// is_last_segment: bool,
// ) -> Result<TypedPatternBitStringSegment, Error> {
// let UntypedPatternBitStringSegment {
// location,
// options,
// value,
// ..
// } = segment;
// let options: Vec<_> = options
// .into_iter()
// .map(|o| infer_bit_string_segment_option(o, |value, typ| self.unify(value, typ)))
// .try_collect()?;
// let segment_type = bit_string::type_options_for_pattern(&options, !is_last_segment)
// .map_err(|error| Error::BitStringSegmentError {
// error: error.error,
// location: error.location,
// })?;
// let typ = {
// match value.deref() {
// Pattern::Var { .. } if segment_type == string() => {
// Err(Error::BitStringSegmentError {
// error: bit_string::ErrorType::VariableUtfSegmentInPattern,
// location,
// })
// }
// _ => Ok(segment_type),
// }
// }?;
// let typed_value = self.unify(*value, typ.clone())?;
// Ok(BitStringSegment {
// location,
// value: Box::new(typed_value),
// options,
// type_: typ,
// })
// }
/// When we have an assignment or a case expression we unify the pattern with the
/// inferred type of the subject in order to determine what variables to insert
/// into the environment (or to detect a type error).
@ -226,9 +159,17 @@ impl<'a, 'b> PatternTyper<'a, 'b> {
pattern: UntypedPattern,
tipo: Arc<Type>,
ann_type: Option<Arc<Type>>,
is_assignment: bool,
) -> Result<TypedPattern, Error> {
match pattern {
Pattern::Discard { name, location } => Ok(Pattern::Discard { name, location }),
Pattern::Discard { name, location } => {
if is_assignment {
// Register declaration for the unused variable detection
self.environment
.init_usage(name.to_string(), EntityKind::Variable, location);
};
Ok(Pattern::Discard { name, location })
}
Pattern::Var { name, location } => {
self.insert_variable(&name, ann_type.unwrap_or(tipo), location, location)?;
@ -236,29 +177,6 @@ impl<'a, 'b> PatternTyper<'a, 'b> {
Ok(Pattern::Var { name, location })
}
// Pattern::Concatenate {
// location,
// left_location,
// right_location,
// left_side_string,
// right_side_assignment,
// } => {
// // The entire concatenate pattern must be a string
// self.environment.unify(tipo, string(), location)?;
// // The right hand side may assign a variable, which is the suffix of the string
// if let AssignName::Variable(right) = &right_side_assignment {
// self.insert_variable(right.as_ref(), string(), right_location, location)?;
// };
// Ok(Pattern::Concatenate {
// location,
// left_location,
// right_location,
// left_side_string,
// right_side_assignment,
// })
// }
Pattern::Assign {
name,
pattern,
@ -271,7 +189,7 @@ impl<'a, 'b> PatternTyper<'a, 'b> {
pattern.location(),
)?;
let pattern = self.unify(*pattern, tipo, ann_type)?;
let pattern = self.unify(*pattern, tipo, ann_type, false)?;
Ok(Pattern::Assign {
name,
@ -299,11 +217,11 @@ impl<'a, 'b> PatternTyper<'a, 'b> {
let elements = elements
.into_iter()
.map(|element| self.unify(element, tipo.clone(), None))
.map(|element| self.unify(element, tipo.clone(), None, false))
.try_collect()?;
let tail = match tail {
Some(tail) => Some(Box::new(self.unify(*tail, list(tipo), None)?)),
Some(tail) => Some(Box::new(self.unify(*tail, list(tipo), None, false)?)),
None => None,
};
@ -336,7 +254,7 @@ impl<'a, 'b> PatternTyper<'a, 'b> {
let mut patterns = vec![];
for (pattern, typ) in elems.into_iter().zip(type_elems) {
let typed_pattern = self.unify(pattern, typ.clone(), None)?;
let typed_pattern = self.unify(pattern, typ.clone(), None, false)?;
patterns.push(typed_pattern);
}
@ -358,7 +276,7 @@ impl<'a, 'b> PatternTyper<'a, 'b> {
let mut patterns = vec![];
for (pattern, type_) in elems.into_iter().zip(elems_types) {
let typed_pattern = self.unify(pattern, type_, None)?;
let typed_pattern = self.unify(pattern, type_, None, false)?;
patterns.push(typed_pattern);
}
@ -498,7 +416,7 @@ impl<'a, 'b> PatternTyper<'a, 'b> {
label,
} = arg;
let value = self.unify(value, typ.clone(), None)?;
let value = self.unify(value, typ.clone(), None, false)?;
Ok::<_, Error>(CallArg {
value,

83
examples/acceptance_tests/077/plutus.json
View File

@ -5,67 +5,52 @@
"plutusVersion": "v2"
},
"validators": [
{
"title": "spend2.backtrace",
"datum": {
"title": "Unit",
"description": "The nullary constructor.",
"schema": {
"anyOf": [
{
"dataType": "constructor",
"index": 0,
"fields": []
}
]
}
},
"redeemer": {
"title": "Unit",
"description": "The nullary constructor.",
"schema": {
"anyOf": [
{
"dataType": "constructor",
"index": 0,
"fields": []
}
]
}
},
"compiledCode": "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",
"hash": "546dac827307d09062352c0f50a35bfd5bcfe64233ea06d791f754ea"
},
{
"title": "spend.staking",
"datum": {
"title": "Unit",
"description": "The nullary constructor.",
"title": "_datum",
"schema": {
"anyOf": [
{
"dataType": "constructor",
"index": 0,
"fields": []
}
]
"$ref": "#/definitions/Void"
}
},
"redeemer": {
"title": "Unit",
"description": "The nullary constructor.",
"title": "_redeemer",
"schema": {
"anyOf": [
{
"dataType": "constructor",
"index": 0,
"fields": []
}
]
"$ref": "#/definitions/Void"
}
},
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"hash": "f6448fb18db20c4da7590f743682d806a7e1ab9cccee75848885b22a"
},
{
"title": "spend2.backtrace",
"datum": {
"title": "_datum",
"schema": {
"$ref": "#/definitions/Void"
}
},
"redeemer": {
"title": "_redeemer",
"schema": {
"$ref": "#/definitions/Void"
}
},
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"hash": "a48c257b952e82673f9832cba28bf43833fddb1b02ec0aeabe25e338"
}
],
"definitions": {
"Void": {
"title": "Unit",
"description": "The nullary constructor.",
"anyOf": [
{
"dataType": "constructor",
"index": 0,
"fields": []
}
]
}
}
}

2
examples/acceptance_tests/run
View File

@ -16,7 +16,7 @@ TARGET="$WORKDIR/$(basename $1)"
TMP=$(mktemp)
VALIDATORS=$(find $TARGET -type f -path "*validators/*.ak")
if [ -z $VALIDATORS ]; then
if [ -z "$VALIDATORS" ]; then
RESULT=$(cargo run --quiet -- check $TARGET 2>$TMP)
else
RESULT=$(cargo run --quiet -- build $TARGET 2>$TMP)