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Rollup merge of #139014 - xizheyin:issue-138931, r=oli-obk

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Improve suggest construct with literal syntax instead of calling

Closing #138931

When constructing a structure through a format similar to calling a constructor, we can use verbose suggestions to hint at using literal syntax for clearer advice. The case of multiple fields is also considered here, provided that the field has the same number of arguments as CallExpr.

r? compiler
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Jacob Pratt 2025-03-27 13:11:20 -04:00 • committed by GitHub
commit d517a4f0ae
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3 changed files with 156 additions and 33 deletions
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106
compiler/rustc_resolve/src/late/diagnostics.rs
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@ -1665,41 +1665,81 @@ impl<'ast, 'ra: 'ast, 'tcx> LateResolutionVisitor<'_, 'ast, 'ra, 'tcx> {
// the struct literal syntax at all, as that will cause a subsequent error.
let fields = this.r.field_idents(def_id);
let has_fields = fields.as_ref().is_some_and(|f| !f.is_empty());
let (fields, applicability) = match fields {
Some(fields) => {
let fields = if let Some(old_fields) = old_fields {
fields
.iter()
.enumerate()
.map(|(idx, new)| (new, old_fields.get(idx)))
.map(|(new, old)| {
if let Some(Some(old)) = old
&& new.as_str() != old
{
format!("{new}: {old}")
} else {
new.to_string()
}
})
.collect::<Vec<String>>()
} else {
fields
.iter()
.map(|f| format!("{f}{tail}"))
.collect::<Vec<String>>()
};
(fields.join(", "), applicability)
}
None => ("/* fields */".to_string(), Applicability::HasPlaceholders),
};
let pad = if has_fields { " " } else { "" };
err.span_suggestion(
if let PathSource::Expr(Some(Expr {
kind: ExprKind::Call(path, args),
span,
format!("use struct {descr} syntax instead"),
format!("{path_str} {{{pad}{fields}{pad}}}"),
applicability,
);
..
})) = source
&& !args.is_empty()
&& let Some(fields) = &fields
&& args.len() == fields.len()
// Make sure we have same number of args as fields
{
let path_span = path.span;
let mut parts = Vec::new();
// Start with the opening brace
parts.push((
path_span.shrink_to_hi().until(args[0].span),
"{".to_owned(),
));
for (field, arg) in fields.iter().zip(args.iter()) {
// Add the field name before the argument
parts.push((arg.span.shrink_to_lo(), format!("{}: ", field)));
}
// Add the closing brace
parts.push((
args.last().unwrap().span.shrink_to_hi().until(span.shrink_to_hi()),
"}".to_owned(),
));
err.multipart_suggestion_verbose(
format!("use struct {descr} syntax instead of calling"),
parts,
applicability,
);
} else {
let (fields, applicability) = match fields {
Some(fields) => {
let fields = if let Some(old_fields) = old_fields {
fields
.iter()
.enumerate()
.map(|(idx, new)| (new, old_fields.get(idx)))
.map(|(new, old)| {
if let Some(Some(old)) = old
&& new.as_str() != old
{
format!("{new}: {old}")
} else {
new.to_string()
}
})
.collect::<Vec<String>>()
} else {
fields
.iter()
.map(|f| format!("{f}{tail}"))
.collect::<Vec<String>>()
};
(fields.join(", "), applicability)
}
None => {
("/* fields */".to_string(), Applicability::HasPlaceholders)
}
};
let pad = if has_fields { " " } else { "" };
err.span_suggestion(
span,
format!("use struct {descr} syntax instead"),
format!("{path_str} {{{pad}{fields}{pad}}}"),
applicability,
);
}
}
if let PathSource::Expr(Some(Expr {
kind: ExprKind::Call(path, args),