polish noncopyable types diagnostic wordings

- replaces "move-only" terminology with "noncopyable"
- replaces compiler jargon like "guaranteed parameters"
  and "lvalue" with corresponding language-level notions
- simplifies diagnostics about closures.

and probably more.

rdar://109281444
(cherry picked from commit 31aa2f7)

Author: kavon

docs/SIL.rst

@@ -2805,7 +2805,7 @@ canonical SIL that the value was never copied and thus is a "move only value"
 even though the actual underlying wrapped type is copyable. As an example of
 this, consider the following Swift::
 
-  func doSomething(@_noImplicitCopy _ x: Klass) -> () { // expected-error {{'x' has guaranteed ownership but was consumed}}
+  func doSomething(@_noImplicitCopy _ x: Klass) -> () { // expected-error {{'x' is borrowed and cannot be consumed}}
     x.doSomething()
     let x2 = x // expected-note {{consuming use}}
     x2.doSomething()

include/swift/AST/DiagnosticsSIL.def

@@ -755,48 +755,35 @@ ERROR(sil_moveonlychecker_owned_value_consumed_and_used_at_same_time, none,
 ERROR(sil_moveonlychecker_value_used_after_consume, none,
       "'%0' used after consume", (StringRef))
 ERROR(sil_moveonlychecker_guaranteed_value_consumed, none,
-      "'%0' has guaranteed ownership but was consumed", (StringRef))
+      "'%0' is borrowed and cannot be consumed", (StringRef))
+
+// FIXME: this diagnostic shouldn't ever be emitted now. rdar://109742587 (closures may still try to consume captures, e.g., borrowed parameters)
 ERROR(sil_moveonlychecker_guaranteed_value_captured_by_closure, none,
-      "'%0' has guaranteed ownership but was consumed due to being captured by a closure", (StringRef))
-ERROR(sil_moveonlychecker_let_value_consumed_in_closure, none,
-      "'%0' consumed in closure. This is illegal since if the closure is invoked more than once the binding will be uninitialized on later invocations", (StringRef))
+      "'%0' is borrowed and cannot be consumed by closure capture", (StringRef))
+
+ERROR(sil_moveonlychecker_capture_consumed_in_closure, none,
+      "captured '%0' cannot be consumed within a closure", (StringRef))
 ERROR(sil_moveonlychecker_inout_not_reinitialized_before_end_of_function, none,
-      "'%0' consumed but not reinitialized before end of function", (StringRef))
-ERROR(sil_moveonlychecker_inout_not_reinitialized_before_end_of_closure, none,
-      "'%0' consumed in closure but not reinitialized before end of closure", (StringRef))
+      "missing reinitialization of '%0' after consume", (StringRef))
 ERROR(sil_moveonlychecker_value_consumed_in_a_loop, none,
       "'%0' consumed by a use in a loop", (StringRef))
-ERROR(sil_moveonlychecker_exclusivity_violation, none,
-      "'%0' has consuming use that cannot be eliminated due to a tight exclusivity scope", (StringRef))
-ERROR(sil_moveonlychecker_moveonly_field_consumed, none,
-      "'%0' has a move only field that was consumed before later uses", (StringRef))
 
-ERROR(sil_moveonlychecker_notconsumable_but_assignable_was_consumed_classfield_let, none,
-      "'%0' was consumed but it is illegal to consume a noncopyable class let field. One can only read from it",
-      (StringRef))
-ERROR(sil_moveonlychecker_notconsumable_but_assignable_was_consumed_classfield_var, none,
-      "'%0' was consumed but it is illegal to consume a noncopyable class var field. One can only read from it or assign to it",
-      (StringRef))
-ERROR(sil_moveonlychecker_notconsumable_but_assignable_was_consumed_global_var, none,
-      "'%0' was consumed but it is illegal to consume a noncopyable global var. One can only read from it or assign to it",
-      (StringRef))
-ERROR(sil_moveonlychecker_notconsumable_but_assignable_was_consumed_global_let, none,
-      "'%0' was consumed but it is illegal to consume a noncopyable global let. One can only read from it",
-      (StringRef))
-ERROR(sil_moveonlychecker_notconsumable_but_assignable_was_consumed_escaping_var, none,
-      "'%0' was consumed but it is illegal to consume a noncopyable mutable capture of an escaping closure. One can only read from it or assign over it",
-      (StringRef))
-ERROR(sil_moveonlychecker_let_capture_consumed, none,
-      "'%0' was consumed but it is illegal to consume a noncopyable immutable capture of an escaping closure. One can only read from it", (StringRef))
+ERROR(sil_moveonlychecker_use_after_partial_consume, none,
+      "cannot use '%0' after partial consume", (StringRef))
+
+ERROR(sil_moveonlychecker_notconsumable_but_assignable_was_consumed, none,
+      "cannot consume noncopyable stored property '%0' %select{of a class|that is global}1",
+      (StringRef, bool))
+
 ERROR(sil_moveonlychecker_cannot_destructure_deinit_nominal_type_self, none,
       "Cannot partially consume '%0' since it has a user defined deinit",
       (StringRef))
 ERROR(sil_moveonlychecker_cannot_destructure_deinit_nominal_type_field, none,
       "Cannot partially consume '%0' since it contains field '%1.%2' whose type %3 has a user defined deinit",
       (StringRef, StringRef, StringRef, DeclBaseName))
 
-NOTE(sil_moveonlychecker_moveonly_field_consumed_here, none,
-     "move only field consumed here", ())
+NOTE(sil_moveonlychecker_partial_consume_here, none,
+     "partial consume here", ())
 NOTE(sil_moveonlychecker_boundary_use, none,
      "boundary use here", ())
 NOTE(sil_moveonlychecker_consuming_use_here, none,
@@ -816,15 +803,6 @@ NOTE(sil_movekillscopyablevalue_value_cyclic_consumed_in_loop_here, none,
 NOTE(sil_moveonlychecker_deinit_here, none,
      "deinit declared here", ())
 
-ERROR(sil_moveonlychecker_not_understand_consumable_and_assignable, none,
-      "Usage of @noImplicitCopy that the move checker does not know how to "
-      "check!", ())
-ERROR(sil_moveonlychecker_not_understand_moveonly, none,
-      "Usage of a move only type that the move checker does not know how to "
-      "check!", ())
-ERROR(sil_moveonlychecker_missed_copy, none,
-      "copy of noncopyable typed value. This is a compiler bug. Please file a bug with a small example of the bug", ())
-
 // move kills copyable values checker diagnostics
 ERROR(sil_movekillscopyablevalue_value_consumed_more_than_once, none,
       "'%0' used after being consumed", (StringRef))
@@ -834,10 +812,22 @@ NOTE(sil_movekillscopyablevalue_use_here, none,
      "use here", ())
 NOTE(sil_movekillscopyablevalue_value_consumed_in_loop, none,
      "consume here would occur multiple times in loop", ())
+
+// errors involving noncopyables that are considered to be bugs in the compiler
+ERROR(sil_moveonlychecker_not_understand_consumable_and_assignable, none,
+      "usage of no-implicit-copy value that the compiler can't verify. This is a compiler bug. Please file a bug with a small example of the bug", ())
+ERROR(sil_moveonlychecker_not_understand_moveonly, none,
+      "usage of a noncopyable type that compiler can't verify. This is a compiler bug. Please file a bug with a small example of the bug"
+      "check!", ())
+ERROR(sil_moveonlychecker_bug_missed_copy, none,
+      "copy of noncopyable typed value. This is a compiler bug. Please file a bug with a small example of the bug", ())
+ERROR(sil_moveonlychecker_bug_exclusivity_violation, none,
+      "'%0' has an unexpected exclusivity violation. This is a compiler bug. Please file a bug with a small example of the bug", (StringRef))
 ERROR(sil_movekillscopyablevalue_move_applied_to_unsupported_move, none,
-      "'consume' applied to value that the compiler does not support checking",
+      "'consume' applied to value that the compiler does not support. This is a compiler bug. Please file a bug with a small example of the bug",
       ())
 
+
 // Implicit inout-to-UnsafeRawPointer conversions
 WARNING(nontrivial_to_rawpointer_conversion,none,
         "forming %1 to a variable of type %0; this is likely incorrect because %2 may contain "

include/swift/AST/DiagnosticsSema.def

@@ -6907,30 +6907,6 @@ ERROR(wrap_invalid_attr_added_by_access_note, none,
 
 #undef WHICH_ACCESS_NOTE
 
-// Move Only diagnostics
-
-ERROR(experimental_moveonly_feature_can_only_be_used_when_enabled,
-      none, "Can not use feature when experimental move only is disabled! Pass"
-      " the frontend flag -enable-experimental-move-only to swift to enable "
-      "the usage of this language feature", ())
-ERROR(noimplicitcopy_attr_valid_only_on_local_let_params,
-      none, "'@_noImplicitCopy' attribute can only be applied to local lets and params", ())
-ERROR(noimplicitcopy_attr_invalid_in_generic_context,
-      none, "'@_noImplicitCopy' attribute cannot be applied to entities in generic contexts", ())
-ERROR(moveonly_generics, none, "move-only type %0 cannot be used with generics yet", (Type))
-ERROR(moveonly_effectful_getter,none,
-      "%0 of move-only type cannot be 'async' or 'throws'", (DescriptiveDeclKind))
-ERROR(noimplicitcopy_attr_not_allowed_on_moveonlytype,none,
-      "'@_noImplicitCopy' has no effect when applied to a move only type", ())
-ERROR(moveonly_enums_do_not_support_indirect,none,
-      "move-only enum %0 cannot be marked indirect or have indirect cases yet", (Identifier))
-ERROR(moveonly_cast,none,
-      "move-only types cannot be conditionally cast", ())
-ERROR(moveonly_failable_init,none,
-      "move-only types cannot have failable initializers yet", ())
-ERROR(moveonly_objc_enum_banned, none,
-      "@objc enums cannot be marked as move-only", ())
-
 //------------------------------------------------------------------------------
 // MARK: Type inference from default expressions
 //------------------------------------------------------------------------------
@@ -6988,21 +6964,6 @@ ERROR(concurrency_task_to_thread_model_global_actor_annotation,none,
       "annotating a type with a global actor %0 is not permitted within %1",
       (TypeRepr*, StringRef))
 
-ERROR(moveOnly_not_allowed_here,none,
-      "'moveOnly' only applies to structs or enums", ())
-ERROR(consume_expression_not_passed_lvalue,none,
-      "'consume' can only be applied to lvalues", ())
-ERROR(borrow_expression_not_passed_lvalue,none,
-      "'borrow' can only be applied to lvalues", ())
-ERROR(copy_expression_not_passed_lvalue,none,
-      "'copy' can only be applied to lvalues", ())
-ERROR(copy_expression_cannot_be_used_with_noncopyable_types,none,
-      "'copy' cannot be applied to noncopyable types", ())
-
-ERROR(moveOnly_requires_lexical_lifetimes,none,
-      "noncopyable types require lexical borrow scopes "
-      "(add -enable-lexical-borrow-scopes=true)", ())
-
 //------------------------------------------------------------------------------
 // MARK: #_hasSymbol
 //------------------------------------------------------------------------------
@@ -7135,31 +7096,68 @@ NOTE(macro_expand_circular_reference_unnamed_through, none,
      "circular reference expanding %0 macros", (StringRef))
 
 //------------------------------------------------------------------------------
-// MARK: Move Only Errors
+// MARK: Noncopyable Types Diagnostics
 //------------------------------------------------------------------------------
 
-ERROR(moveonly_copyable_type_that_contains_moveonly_type, none,
-      "%0 %1 cannot contain a move-only type without also being move-only",
+ERROR(noncopyable_within_copyable, none,
+      "%0 %1 cannot contain a noncopyable type without also being noncopyable",
       (DescriptiveDeclKind, DeclName))
-NOTE(moveonly_copyable_type_that_contains_moveonly_type_location, none,
-     "contained move-only %0 '%1.%2'",
+NOTE(noncopyable_within_copyable_location, none,
+     "contained noncopyable %0 '%1.%2'",
      (DescriptiveDeclKind, StringRef, StringRef))
-ERROR(moveonly_cannot_conform_to_type, none,
-     "move-only %0 %1 cannot conform to %2",
+ERROR(noncopyable_cannot_conform_to_type, none,
+     "noncopyable %0 %1 cannot conform to %2",
      (DescriptiveDeclKind, DeclName, Type))
-ERROR(moveonly_parameter_missing_ownership, none,
+ERROR(noncopyable_parameter_requires_ownership, none,
       "noncopyable parameter must specify its ownership", ())
-ERROR(moveonly_parameter_subscript_unsupported, none,
+ERROR(noncopyable_parameter_subscript_unsupported, none,
       "subscripts cannot have noncopyable parameters yet", ())
-NOTE(moveonly_parameter_ownership_suggestion, none,
+NOTE(noncopyable_parameter_ownership_suggestion, none,
       "add '%0' %1", (StringRef, StringRef))
 ERROR(ownership_specifier_copyable,none,
-      "Copyable types cannot be 'consuming' or 'borrowing' yet", ())
+      "copyable types cannot be 'consuming' or 'borrowing' yet", ())
 ERROR(self_ownership_specifier_copyable,none,
-      "%0 is not yet valid on %1s in a Copyable type",
+      "%0 is not yet valid on %1s of a copyable type",
       (SelfAccessKind, DescriptiveDeclKind))
 ERROR(ownership_specifier_nonescaping_closure,none,
       "'%0' cannot be applied to nonescaping closure", (StringRef))
+ERROR(noncopyable_generics, none, "noncopyable type %0 cannot be used with generics yet", (Type))
+ERROR(noncopyable_effectful_getter,none,
+      "%0 of noncopyable type cannot be 'async' or 'throws'", (DescriptiveDeclKind))
+ERROR(noncopyable_enums_do_not_support_indirect,none,
+      "noncopyable enum %0 cannot be marked indirect or have indirect cases yet", (Identifier))
+ERROR(noncopyable_cast,none,
+      "noncopyable types cannot be conditionally cast", ())
+ERROR(noncopyable_failable_init,none,
+      "noncopyable types cannot have failable initializers yet", ())
+ERROR(noncopyable_objc_enum, none,
+      "noncopyable enums cannot be marked '@objc'", ())
+ERROR(moveOnly_not_allowed_here,none,
+      "'@_moveOnly' attribute is only valid on structs or enums", ())
+ERROR(consume_expression_not_passed_lvalue,none,
+      "'consume' can only be applied to a local binding ('let', 'var', or parameter)", ())
+ERROR(borrow_expression_not_passed_lvalue,none,
+      "'borrow' can only be applied to a local binding ('let', 'var', or parameter)", ())
+ERROR(copy_expression_not_passed_lvalue,none,
+      "'copy' can only be applied to a local binding ('let', 'var', or parameter)", ())
+ERROR(copy_expression_cannot_be_used_with_noncopyable_types,none,
+      "'copy' cannot be applied to noncopyable types", ())
+
+ERROR(moveOnly_requires_lexical_lifetimes,none,
+      "noncopyable types require lexical borrow scopes "
+      "(add -enable-lexical-borrow-scopes=true)", ())
+
+// Experimental noncopyable feature diagnostics:
+ERROR(experimental_moveonly_feature_can_only_be_used_when_enabled,
+      none, "Can not use feature when experimental move only is disabled! Pass"
+            " the frontend flag -enable-experimental-move-only to swift to enable "
+            "the usage of this language feature", ())
+ERROR(noimplicitcopy_attr_valid_only_on_local_let_params,
+      none, "'@_noImplicitCopy' attribute can only be applied to local lets and params", ())
+ERROR(noimplicitcopy_attr_invalid_in_generic_context,
+      none, "'@_noImplicitCopy' attribute cannot be applied to entities in generic contexts", ())
+ERROR(noimplicitcopy_attr_not_allowed_on_moveonlytype,none,
+      "'@_noImplicitCopy' has no effect when applied to a noncopyable type", ())
 
 //------------------------------------------------------------------------------
 // MARK: Runtime discoverable attributes (@runtimeMetadata)