remove support for the #[start] attribute

4 files changed, 0 insertions, 17 deletions

diff --git a/compiler/rustc_trait_selection/messages.ftl b/compiler/rustc_trait_selection/messages.ftl
index b82bb27eb79..750d2756b4a 100644
--- a/compiler/rustc_trait_selection/messages.ftl
+++ b/compiler/rustc_trait_selection/messages.ftl
@@ -261,7 +261,6 @@ trait_selection_oc_fn_lang_correct_type = {$lang_item_name ->
         *[lang_item_name] lang item `{$lang_item_name}`
     } function has wrong type
 trait_selection_oc_fn_main_correct_type = `main` function has wrong type
-trait_selection_oc_fn_start_correct_type = `#[start]` function has wrong type
 trait_selection_oc_generic = mismatched types
 
 trait_selection_oc_if_else_different = `if` and `else` have incompatible types
@@ -396,7 +395,6 @@ trait_selection_subtype = ...so that the {$requirement ->
     [if_else_different] `if` and `else` have incompatible types
     [no_else] `if` missing an `else` returns `()`
     [fn_main_correct_type] `main` function has the correct type
-    [fn_start_correct_type] `#[start]` function has the correct type
     [fn_lang_correct_type] lang item function has the correct type
     [intrinsic_correct_type] intrinsic has the correct type
     [method_correct_type] method receiver has the correct type
@@ -410,7 +408,6 @@ trait_selection_subtype_2 = ...so that {$requirement ->
     [if_else_different] `if` and `else` have incompatible types
     [no_else] `if` missing an `else` returns `()`
     [fn_main_correct_type] `main` function has the correct type
-    [fn_start_correct_type] `#[start]` function has the correct type
     [fn_lang_correct_type] lang item function has the correct type
     [intrinsic_correct_type] intrinsic has the correct type
     [method_correct_type] method receiver has the correct type
diff --git a/compiler/rustc_trait_selection/src/error_reporting/infer/mod.rs b/compiler/rustc_trait_selection/src/error_reporting/infer/mod.rs
index 7032f7b9d31..ceef199cc61 100644
--- a/compiler/rustc_trait_selection/src/error_reporting/infer/mod.rs
+++ b/compiler/rustc_trait_selection/src/error_reporting/infer/mod.rs
@@ -2310,7 +2310,6 @@ impl<'tcx> ObligationCause<'tcx> {
             | ObligationCauseCode::MatchExpressionArm(_)
             | ObligationCauseCode::IfExpression { .. }
             | ObligationCauseCode::LetElse
-            | ObligationCauseCode::StartFunctionType
             | ObligationCauseCode::LangFunctionType(_)
             | ObligationCauseCode::IntrinsicType
             | ObligationCauseCode::MethodReceiver => FailureCode::Error0308,
@@ -2368,9 +2367,6 @@ impl<'tcx> ObligationCause<'tcx> {
             ObligationCauseCode::MainFunctionType => {
                 ObligationCauseFailureCode::FnMainCorrectType { span }
             }
-            ObligationCauseCode::StartFunctionType => {
-                ObligationCauseFailureCode::FnStartCorrectType { span, subdiags }
-            }
             &ObligationCauseCode::LangFunctionType(lang_item_name) => {
                 ObligationCauseFailureCode::FnLangCorrectType { span, subdiags, lang_item_name }
             }
@@ -2413,7 +2409,6 @@ impl<'tcx> ObligationCause<'tcx> {
                 "const is compatible with trait"
             }
             ObligationCauseCode::MainFunctionType => "`main` function has the correct type",
-            ObligationCauseCode::StartFunctionType => "`#[start]` function has the correct type",
             ObligationCauseCode::LangFunctionType(_) => "lang item function has the correct type",
             ObligationCauseCode::IntrinsicType => "intrinsic has the correct type",
             ObligationCauseCode::MethodReceiver => "method receiver has the correct type",
@@ -2434,7 +2429,6 @@ impl IntoDiagArg for ObligationCauseAsDiagArg<'_> {
                 "const_compat"
             }
             ObligationCauseCode::MainFunctionType => "fn_main_correct_type",
-            ObligationCauseCode::StartFunctionType => "fn_start_correct_type",
             ObligationCauseCode::LangFunctionType(_) => "fn_lang_correct_type",
             ObligationCauseCode::IntrinsicType => "intrinsic_correct_type",
             ObligationCauseCode::MethodReceiver => "method_correct_type",
diff --git a/compiler/rustc_trait_selection/src/error_reporting/traits/suggestions.rs b/compiler/rustc_trait_selection/src/error_reporting/traits/suggestions.rs
index 9d85ca1dd4d..80f37180f13 100644
--- a/compiler/rustc_trait_selection/src/error_reporting/traits/suggestions.rs
+++ b/compiler/rustc_trait_selection/src/error_reporting/traits/suggestions.rs
@@ -2740,7 +2740,6 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
             | ObligationCauseCode::IfExpression { .. }
             | ObligationCauseCode::IfExpressionWithNoElse
             | ObligationCauseCode::MainFunctionType
-            | ObligationCauseCode::StartFunctionType
             | ObligationCauseCode::LangFunctionType(_)
             | ObligationCauseCode::IntrinsicType
             | ObligationCauseCode::MethodReceiver
diff --git a/compiler/rustc_trait_selection/src/errors.rs b/compiler/rustc_trait_selection/src/errors.rs
index 53a4e5031c6..0bf91ad35c1 100644
--- a/compiler/rustc_trait_selection/src/errors.rs
+++ b/compiler/rustc_trait_selection/src/errors.rs
@@ -1695,13 +1695,6 @@ pub enum ObligationCauseFailureCode {
         #[primary_span]
         span: Span,
     },
-    #[diag(trait_selection_oc_fn_start_correct_type, code = E0308)]
-    FnStartCorrectType {
-        #[primary_span]
-        span: Span,
-        #[subdiagnostic]
-        subdiags: Vec<TypeErrorAdditionalDiags>,
-    },
     #[diag(trait_selection_oc_fn_lang_correct_type, code = E0308)]
     FnLangCorrectType {
         #[primary_span]