Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Fix issues with const argument inference #61570

Merged
merged 6 commits into from
Jun 10, 2019
Merged

Fix issues with const argument inference #61570

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
6 commits
Select commit Hold shift + click to select a range
f1867c5
Rename `infer_types` to `infer_args`
varkor Jun 7, 2019
5377dea
Fix issue with const arg inference
varkor Jun 6, 2019
a0e3e9a
Refactor `ty_infer` and `re_infer`
varkor Jun 6, 2019
647b4a4
Add test for const generics struct constructor
varkor Jun 6, 2019
7bb0a16
Add test for deriving Debug for const generics
varkor Jun 6, 2019
f11e6f7
Fix issue with path segment lowering with const args
varkor Jun 6, 2019
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
21 changes: 11 additions & 10 deletions src/librustc/hir/lowering.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -2168,7 +2168,7 @@ impl<'a> LoweringContext<'a> {
itctx: ImplTraitContext<'_>,
explicit_owner: Option<NodeId>,
) -> hir::PathSegment {
let (mut generic_args, infer_types) = if let Some(ref generic_args) = segment.args {
let (mut generic_args, infer_args) = if let Some(ref generic_args) = segment.args {
let msg = "parenthesized type parameters may only be used with a `Fn` trait";
match **generic_args {
GenericArgs::AngleBracketed(ref data) => {
Expand Down Expand Up @@ -2230,17 +2230,17 @@ impl<'a> LoweringContext<'a> {
.collect();
if expected_lifetimes > 0 && param_mode == ParamMode::Explicit {
let anon_lt_suggestion = vec!["'_"; expected_lifetimes].join(", ");
let no_ty_args = generic_args.args.len() == expected_lifetimes;
let no_non_lt_args = generic_args.args.len() == expected_lifetimes;
let no_bindings = generic_args.bindings.is_empty();
let (incl_angl_brckt, insertion_span, suggestion) = if no_ty_args && no_bindings {
let (incl_angl_brckt, insertion_sp, suggestion) = if no_non_lt_args && no_bindings {
// If there are no (non-implicit) generic args or associated type
// bindings, our suggestion includes the angle brackets.
(true, path_span.shrink_to_hi(), format!("<{}>", anon_lt_suggestion))
} else {
// Otherwise (sorry, this is kind of gross) we need to infer the
// place to splice in the `'_, ` from the generics that do exist.
let first_generic_span = first_generic_span
.expect("already checked that type args or bindings exist");
.expect("already checked that non-lifetime args or bindings exist");
(false, first_generic_span.shrink_to_lo(), format!("{}, ", anon_lt_suggestion))
};
match self.anonymous_lifetime_mode {
Expand All @@ -2263,7 +2263,7 @@ impl<'a> LoweringContext<'a> {
expected_lifetimes,
path_span,
incl_angl_brckt,
insertion_span,
insertion_sp,
suggestion,
);
err.emit();
Expand All @@ -2280,7 +2280,7 @@ impl<'a> LoweringContext<'a> {
expected_lifetimes,
path_span,
incl_angl_brckt,
insertion_span,
insertion_sp,
suggestion,
)
);
Expand All @@ -2305,7 +2305,7 @@ impl<'a> LoweringContext<'a> {
Some(id),
Some(self.lower_res(res)),
generic_args,
infer_types,
infer_args,
)
}

Expand All @@ -2316,9 +2316,10 @@ impl<'a> LoweringContext<'a> {
mut itctx: ImplTraitContext<'_>,
) -> (hir::GenericArgs, bool) {
let &AngleBracketedArgs { ref args, ref constraints, .. } = data;
let has_types = args.iter().any(|arg| match arg {
let has_non_lt_args = args.iter().any(|arg| match arg {
ast::GenericArg::Lifetime(_) => false,
ast::GenericArg::Type(_) => true,
_ => false,
ast::GenericArg::Const(_) => true,
});
(
hir::GenericArgs {
Expand All @@ -2328,7 +2329,7 @@ impl<'a> LoweringContext<'a> {
.collect(),
parenthesized: false,
},
!has_types && param_mode == ParamMode::Optional
!has_non_lt_args && param_mode == ParamMode::Optional
)
}

Expand Down
8 changes: 4 additions & 4 deletions src/librustc/hir/mod.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -348,7 +348,7 @@ pub struct PathSegment {
/// This only applies to expression and pattern paths, and
/// out of those only the segments with no type parameters
/// to begin with, e.g., `Vec::new` is `<Vec<..>>::new::<..>`.
pub infer_types: bool,
pub infer_args: bool,
}

impl PathSegment {
Expand All @@ -358,7 +358,7 @@ impl PathSegment {
ident,
hir_id: None,
res: None,
infer_types: true,
infer_args: true,
args: None,
}
}
Expand All @@ -368,13 +368,13 @@ impl PathSegment {
hir_id: Option<HirId>,
res: Option<Res>,
args: GenericArgs,
infer_types: bool,
infer_args: bool,
) -> Self {
PathSegment {
ident,
hir_id,
res,
infer_types,
infer_args,
args: if args.is_empty() {
None
} else {
Expand Down
16 changes: 8 additions & 8 deletions src/librustc/hir/print.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -1196,7 +1196,7 @@ impl<'a> State<'a> {

segment.with_generic_args(|generic_args| {
if !generic_args.args.is_empty() || !generic_args.bindings.is_empty() {
return self.print_generic_args(&generic_args, segment.infer_types, true);
return self.print_generic_args(&generic_args, segment.infer_args, true);
}
Ok(())
})?;
Expand Down Expand Up @@ -1561,7 +1561,7 @@ impl<'a> State<'a> {
if segment.ident.name != kw::PathRoot {
self.print_ident(segment.ident)?;
segment.with_generic_args(|generic_args| {
self.print_generic_args(generic_args, segment.infer_types,
self.print_generic_args(generic_args, segment.infer_args,
colons_before_params)
})?;
}
Expand All @@ -1574,7 +1574,7 @@ impl<'a> State<'a> {
if segment.ident.name != kw::PathRoot {
self.print_ident(segment.ident)?;
segment.with_generic_args(|generic_args| {
self.print_generic_args(generic_args, segment.infer_types, false)
self.print_generic_args(generic_args, segment.infer_args, false)
})?;
}
Ok(())
Expand Down Expand Up @@ -1602,7 +1602,7 @@ impl<'a> State<'a> {
self.print_ident(segment.ident)?;
segment.with_generic_args(|generic_args| {
self.print_generic_args(generic_args,
segment.infer_types,
segment.infer_args,
colons_before_params)
})?;
}
Expand All @@ -1614,7 +1614,7 @@ impl<'a> State<'a> {
self.print_ident(item_segment.ident)?;
item_segment.with_generic_args(|generic_args| {
self.print_generic_args(generic_args,
item_segment.infer_types,
item_segment.infer_args,
colons_before_params)
})
}
Expand All @@ -1626,7 +1626,7 @@ impl<'a> State<'a> {
self.print_ident(item_segment.ident)?;
item_segment.with_generic_args(|generic_args| {
self.print_generic_args(generic_args,
item_segment.infer_types,
item_segment.infer_args,
colons_before_params)
})
}
Expand All @@ -1635,7 +1635,7 @@ impl<'a> State<'a> {

fn print_generic_args(&mut self,
generic_args: &hir::GenericArgs,
infer_types: bool,
infer_args: bool,
colons_before_params: bool)
-> io::Result<()> {
if generic_args.parenthesized {
Expand Down Expand Up @@ -1681,7 +1681,7 @@ impl<'a> State<'a> {

// FIXME(eddyb): this would leak into error messages (e.g.,
// "non-exhaustive patterns: `Some::<..>(_)` not covered").
if infer_types && false {
if infer_args && false {
start_or_comma(self)?;
self.s.word("..")?;
}
Expand Down
Loading