Migrate OpaqueHiddenType, E0282, E0283, E0284, E0698

1 files changed, 187 insertions, 0 deletions

diff --git a/compiler/rustc_infer/src/errors.rs b/compiler/rustc_infer/src/errors.rs
new file mode 100644
index 00000000000..7bd418ddf5f
--- /dev/null
+++ b/compiler/rustc_infer/src/errors.rs
@@ -0,0 +1,187 @@
+use rustc_errors::{fluent, AddSubdiagnostic};
+use rustc_hir::FnRetTy;
+use rustc_macros::SessionDiagnostic;
+use rustc_span::{BytePos, Span};
+
+#[derive(SessionDiagnostic)]
+#[diag(infer::opaque_hidden_type)]
+pub struct OpaqueHiddenTypeDiag {
+    #[primary_span]
+    #[label]
+    pub span: Span,
+    #[note(infer::opaque_type)]
+    pub opaque_type: Span,
+    #[note(infer::hidden_type)]
+    pub hidden_type: Span,
+}
+
+#[derive(SessionDiagnostic)]
+#[diag(infer::type_annotations_needed, code = "E0282")]
+pub struct AnnotationRequired<'a> {
+    #[primary_span]
+    pub span: Span,
+    pub source_kind: &'static str,
+    pub source_name: &'a str,
+    #[label]
+    pub failure_span: Option<Span>,
+    #[subdiagnostic]
+    pub bad_label: Option<InferenceBadError<'a>>,
+    #[subdiagnostic]
+    pub infer_subdiags: Vec<SourceKindSubdiag<'a>>,
+    #[subdiagnostic]
+    pub multi_suggestions: Vec<SourceKindMultiSuggestion<'a>>,
+}
+
+// Copy of `AnnotationRequired` for E0283
+#[derive(SessionDiagnostic)]
+#[diag(infer::type_annotations_needed, code = "E0283")]
+pub struct AmbigousImpl<'a> {
+    #[primary_span]
+    pub span: Span,
+    pub source_kind: &'static str,
+    pub source_name: &'a str,
+    #[label]
+    pub failure_span: Option<Span>,
+    #[subdiagnostic]
+    pub bad_label: Option<InferenceBadError<'a>>,
+    #[subdiagnostic]
+    pub infer_subdiags: Vec<SourceKindSubdiag<'a>>,
+    #[subdiagnostic]
+    pub multi_suggestions: Vec<SourceKindMultiSuggestion<'a>>,
+}
+
+// Copy of `AnnotationRequired` for E0284
+#[derive(SessionDiagnostic)]
+#[diag(infer::type_annotations_needed, code = "E0284")]
+pub struct AmbigousReturn<'a> {
+    #[primary_span]
+    pub span: Span,
+    pub source_kind: &'static str,
+    pub source_name: &'a str,
+    #[label]
+    pub failure_span: Option<Span>,
+    #[subdiagnostic]
+    pub bad_label: Option<InferenceBadError<'a>>,
+    #[subdiagnostic]
+    pub infer_subdiags: Vec<SourceKindSubdiag<'a>>,
+    #[subdiagnostic]
+    pub multi_suggestions: Vec<SourceKindMultiSuggestion<'a>>,
+}
+
+#[derive(SessionDiagnostic)]
+#[diag(infer::need_type_info_in_generator, code = "E0698")]
+pub struct NeedTypeInfoInGenerator<'a> {
+    #[primary_span]
+    pub span: Span,
+    pub generator_kind: String,
+    #[subdiagnostic]
+    pub bad_label: InferenceBadError<'a>,
+}
+
+// Used when a better one isn't available
+#[derive(SessionSubdiagnostic)]
+#[label(infer::label_bad)]
+pub struct InferenceBadError<'a> {
+    #[primary_span]
+    pub span: Span,
+    pub bad_kind: &'static str,
+    pub prefix_kind: &'static str,
+    pub has_parent: bool,
+    pub prefix: &'a str,
+    pub parent_prefix: &'a str,
+    pub parent_name: String,
+    pub name: String,
+}
+
+#[derive(SessionSubdiagnostic)]
+pub enum SourceKindSubdiag<'a> {
+    #[suggestion_verbose(
+        infer::source_kind_subdiag_let,
+        code = ": {type_name}",
+        applicability = "has-placeholders"
+    )]
+    LetLike {
+        #[primary_span]
+        span: Span,
+        name: String,
+        type_name: String,
+        kind: &'static str,
+        x_kind: &'static str,
+        prefix_kind: &'static str,
+        prefix: &'a str,
+        arg_name: String,
+    },
+    #[label(infer::source_kind_subdiag_generic_label)]
+    GenericLabel {
+        #[primary_span]
+        span: Span,
+        is_type: bool,
+        param_name: String,
+        parent_exists: bool,
+        parent_prefix: String,
+        parent_name: String,
+    },
+    #[suggestion_verbose(
+        infer::source_kind_subdiag_generic_suggestion,
+        code = "::<{args}>",
+        applicability = "has-placeholders"
+    )]
+    GenericSuggestion {
+        #[primary_span]
+        span: Span,
+        arg_count: usize,
+        args: String,
+    },
+}
+
+// Has to be implemented manually because multipart suggestions are not supported by the derive macro.
+// Would be a part of `SourceKindSubdiag` otherwise.
+pub enum SourceKindMultiSuggestion<'a> {
+    FullyQualified {
+        span: Span,
+        def_path: String,
+        adjustment: &'a str,
+        successor: (&'a str, BytePos),
+    },
+    ClosureReturn {
+        ty_info: String,
+        data: &'a FnRetTy<'a>,
+        should_wrap_expr: Option<Span>,
+    },
+}
+
+impl AddSubdiagnostic for SourceKindMultiSuggestion<'_> {
+    fn add_to_diagnostic(self, diag: &mut rustc_errors::Diagnostic) {
+        match self {
+            Self::FullyQualified { span, def_path, adjustment, successor } => {
+                let suggestion = vec![
+                    (span.shrink_to_lo(), format!("{def_path}({adjustment}")),
+                    (span.shrink_to_hi().with_hi(successor.1), successor.0.to_string()),
+                ];
+                diag.multipart_suggestion_verbose(
+                    fluent::infer::source_kind_fully_qualified,
+                    suggestion,
+                    rustc_errors::Applicability::HasPlaceholders,
+                );
+            }
+            Self::ClosureReturn { ty_info, data, should_wrap_expr } => {
+                let (arrow, post) = match data {
+                    FnRetTy::DefaultReturn(_) => ("-> ", " "),
+                    _ => ("", ""),
+                };
+                let suggestion = match should_wrap_expr {
+                    Some(end_span) => vec![
+                        (data.span(), format!("{}{}{}{{ ", arrow, ty_info, post)),
+                        (end_span, " }".to_string()),
+                    ],
+                    None => vec![(data.span(), format!("{}{}{}", arrow, ty_info, post))],
+                };
+                diag.multipart_suggestion_verbose(
+                    fluent::infer::source_kind_closure_return,
+                    suggestion,
+                    rustc_errors::Applicability::HasPlaceholders,
+                );
+            }
+        }
+    }
+}