Auto merge of #101138 - Rejyr:diagnostic-migration-rustc-lint-pt2, r=davidtwco

Migrate `rustc_lint` lint diagnostics

Part 2 of [Migrate `rustc_lint` errors to `SessionDiagnostic`](#100776)

r? `@davidtwco`

# TODO
- [x] Refactor some lints manually implementing `DecorateLint` to use `Option<Subdiagnostic>`.
- [x] Add `#[rustc_lint_diagnostics]` to lint functions in `context.rs`.
- [x] Migrate `hidden_unicode_codepoints.rs`.
- [x] Migrate `UnsafeCode` in `builtin.rs`.
- [x] Migrate the rest of `builtin.rs`.

Author: bors

compiler/rustc_error_messages/locales/en-US/lint.ftl

@@ -15,6 +15,43 @@ lint_enum_intrinsics_mem_variant =
 
 lint_expectation = this lint expectation is unfulfilled
     .note = the `unfulfilled_lint_expectations` lint can't be expected and will always produce this message
+    .rationale = {$rationale}
+
+lint_for_loops_over_fallibles =
+    for loop over {$article} `{$ty}`. This is more readably written as an `if let` statement
+    .suggestion = consider using `if let` to clear intent
+    .remove_next = to iterate over `{$recv_snip}` remove the call to `next`
+    .use_while_let = to check pattern in a loop use `while let`
+    .use_question_mark = consider unwrapping the `Result` with `?` to iterate over its contents
+
+lint_non_binding_let_on_sync_lock =
+    non-binding let on a synchronization lock
+
+lint_non_binding_let_on_drop_type =
+    non-binding let on a type that implements `Drop`
+
+lint_non_binding_let_suggestion =
+    consider binding to an unused variable to avoid immediately dropping the value
+
+lint_non_binding_let_multi_suggestion =
+    consider immediately dropping the value
+
+lint_deprecated_lint_name =
+    lint name `{$name}` is deprecated and may not have an effect in the future.
+    .suggestion = change it to
+
+lint_renamed_or_removed_lint = {$msg}
+    .suggestion = use the new name
+
+lint_unknown_lint =
+    unknown lint: `{$name}`
+    .suggestion = did you mean
+
+lint_ignored_unless_crate_specified = {$level}({$name}) is ignored unless specified at crate level
+
+lint_unknown_gated_lint =
+    unknown lint: `{$name}`
+    .note = the `{$name}` lint is unstable
 
 lint_hidden_unicode_codepoints = unicode codepoint changing visible direction of text present in {$label}
     .label = this {$label} contains {$count ->
@@ -55,6 +92,8 @@ lint_diag_out_of_impl =
 
 lint_untranslatable_diag = diagnostics should be created using translatable messages
 
+lint_bad_opt_access = {$msg}
+
 lint_cstring_ptr = getting the inner pointer of a temporary `CString`
     .as_ptr_label = this pointer will be invalid
     .unwrap_label = this `CString` is deallocated at the end of the statement, bind it to a variable to extend its lifetime
@@ -331,6 +370,8 @@ lint_builtin_anonymous_params = anonymous parameters are deprecated and will be
     .suggestion = try naming the parameter or explicitly ignoring it
 
 lint_builtin_deprecated_attr_link = use of deprecated attribute `{$name}`: {$reason}. See {$link}
+    .msg_suggestion = {$msg}
+    .default_suggestion = remove this attribute
 lint_builtin_deprecated_attr_used = use of deprecated attribute `{$name}`: no longer used.
 lint_builtin_deprecated_attr_default_suggestion = remove this attribute
 
@@ -391,10 +432,16 @@ lint_builtin_incomplete_features = the feature `{$name}` is incomplete and may n
     .note = see issue #{$n} <https://github.com/rust-lang/rust/issues/{$n}> for more information
     .help = consider using `min_{$name}` instead, which is more stable and complete
 
-lint_builtin_clashing_extern_same_name = `{$this_fi}` redeclared with a different signature
+lint_builtin_unpermitted_type_init_zeroed = the type `{$ty}` does not permit zero-initialization
+lint_builtin_unpermitted_type_init_unint = the type `{$ty}` does not permit being left uninitialized
+
+lint_builtin_unpermitted_type_init_label = this code causes undefined behavior when executed
+lint_builtin_unpermitted_type_init_label_suggestion = help: use `MaybeUninit<T>` instead, and only call `assume_init` after initialization is done
+
+lint_builtin_clashing_extern_same_name = `{$this}` redeclared with a different signature
     .previous_decl_label = `{$orig}` previously declared here
     .mismatch_label = this signature doesn't match the previous declaration
-lint_builtin_clashing_extern_diff_name = `{$this_fi}` redeclares `{$orig}` with a different signature
+lint_builtin_clashing_extern_diff_name = `{$this}` redeclares `{$orig}` with a different signature
     .previous_decl_label = `{$orig}` previously declared here
     .mismatch_label = this signature doesn't match the previous declaration
 
@@ -403,6 +450,16 @@ lint_builtin_deref_nullptr = dereferencing a null pointer
 
 lint_builtin_asm_labels = avoid using named labels in inline assembly
 
+lint_builtin_special_module_name_used_lib = found module declaration for lib.rs
+    .note = lib.rs is the root of this crate's library target
+    .help = to refer to it from other targets, use the library's name as the path
+
+lint_builtin_special_module_name_used_main = found module declaration for main.rs
+    .note = a binary crate cannot be used as library
+
+lint_supertrait_as_deref_target = `{$t}` implements `Deref` with supertrait `{$target_principal}` as target
+    .label = target type is set here
+
 lint_overruled_attribute = {$lint_level}({$lint_source}) incompatible with previous forbid
     .label = overruled by previous forbid
 

compiler/rustc_lint/src/array_into_iter.rs

@@ -1,5 +1,5 @@
+use crate::lints::{ArrayIntoIterDiag, ArrayIntoIterDiagSub};
 use crate::{LateContext, LateLintPass, LintContext};
-use rustc_errors::{fluent, Applicability};
 use rustc_hir as hir;
 use rustc_middle::ty;
 use rustc_middle::ty::adjustment::{Adjust, Adjustment};
@@ -118,41 +118,23 @@ impl<'tcx> LateLintPass<'tcx> for ArrayIntoIter {
                 // to an array or to a slice.
                 _ => bug!("array type coerced to something other than array or slice"),
             };
-            cx.struct_span_lint(
+            let sub = if self.for_expr_span == expr.span {
+                Some(ArrayIntoIterDiagSub::RemoveIntoIter {
+                    span: receiver_arg.span.shrink_to_hi().to(expr.span.shrink_to_hi()),
+                })
+            } else if receiver_ty.is_array() {
+                Some(ArrayIntoIterDiagSub::UseExplicitIntoIter {
+                    start_span: expr.span.shrink_to_lo(),
+                    end_span: receiver_arg.span.shrink_to_hi().to(expr.span.shrink_to_hi()),
+                })
+            } else {
+                None
+            };
+            cx.emit_spanned_lint(
                 ARRAY_INTO_ITER,
                 call.ident.span,
-                fluent::lint_array_into_iter,
-                |diag| {
-                    diag.set_arg("target", target);
-                    diag.span_suggestion(
-                        call.ident.span,
-                        fluent::use_iter_suggestion,
-                        "iter",
-                        Applicability::MachineApplicable,
-                    );
-                    if self.for_expr_span == expr.span {
-                        diag.span_suggestion(
-                            receiver_arg.span.shrink_to_hi().to(expr.span.shrink_to_hi()),
-                            fluent::remove_into_iter_suggestion,
-                            "",
-                            Applicability::MaybeIncorrect,
-                        );
-                    } else if receiver_ty.is_array() {
-                        diag.multipart_suggestion(
-                            fluent::use_explicit_into_iter_suggestion,
-                            vec![
-                                (expr.span.shrink_to_lo(), "IntoIterator::into_iter(".into()),
-                                (
-                                    receiver_arg.span.shrink_to_hi().to(expr.span.shrink_to_hi()),
-                                    ")".into(),
-                                ),
-                            ],
-                            Applicability::MaybeIncorrect,
-                        );
-                    }
-                    diag
-                },
-            )
+                ArrayIntoIterDiag { target, suggestion: call.ident.span, sub },
+            );
         }
     }
 }