Make "consider importing" consistent for macros

compiler/rustc_resolve/src/diagnostics.rs

@@ -1352,6 +1352,7 @@ impl<'a, 'tcx> Resolver<'a, 'tcx> {
         macro_kind: MacroKind,
         parent_scope: &ParentScope<'a>,
         ident: Ident,
+        krate: &Crate,
     ) {
         let is_expected = &|res: Res| res.macro_kind() == Some(macro_kind);
         let suggestion = self.early_lookup_typo_candidate(
@@ -1364,13 +1365,17 @@ impl<'a, 'tcx> Resolver<'a, 'tcx> {
 
         let import_suggestions =
             self.lookup_import_candidates(ident, Namespace::MacroNS, parent_scope, is_expected);
+        let (span, found_use) = match parent_scope.module.nearest_parent_mod().as_local() {
+            Some(def_id) => UsePlacementFinder::check(krate, self.def_id_to_node_id[def_id]),
+            None => (None, FoundUse::No),
+        };
         show_candidates(
             self.tcx,
             err,
-            None,
+            span,
             &import_suggestions,
             Instead::No,
-            FoundUse::Yes,
+            found_use,
             DiagnosticMode::Normal,
             vec![],
             "",

compiler/rustc_resolve/src/lib.rs

@@ -1522,7 +1522,9 @@ impl<'a, 'tcx> Resolver<'a, 'tcx> {
             self.tcx.sess.time("check_hidden_glob_reexports", || {
                 self.check_hidden_glob_reexports(exported_ambiguities)
             });
-            self.tcx.sess.time("finalize_macro_resolutions", || self.finalize_macro_resolutions());
+            self.tcx
+                .sess
+                .time("finalize_macro_resolutions", || self.finalize_macro_resolutions(krate));
             self.tcx.sess.time("late_resolve_crate", || self.late_resolve_crate(krate));
             self.tcx.sess.time("resolve_main", || self.resolve_main());
             self.tcx.sess.time("resolve_check_unused", || self.check_unused(krate));

compiler/rustc_resolve/src/macros.rs

@@ -7,7 +7,7 @@ use crate::{BuiltinMacroState, Determinacy};
 use crate::{DeriveData, Finalize, ParentScope, ResolutionError, Resolver, ScopeSet};
 use crate::{ModuleKind, ModuleOrUniformRoot, NameBinding, PathResult, Segment};
 use rustc_ast::expand::StrippedCfgItem;
-use rustc_ast::{self as ast, attr, Inline, ItemKind, ModKind, NodeId};
+use rustc_ast::{self as ast, attr, Crate, Inline, ItemKind, ModKind, NodeId};
 use rustc_ast_pretty::pprust;
 use rustc_attr::StabilityLevel;
 use rustc_data_structures::intern::Interned;
@@ -674,7 +674,7 @@ impl<'a, 'tcx> Resolver<'a, 'tcx> {
         res.map(|res| (self.get_macro(res).map(|macro_data| macro_data.ext), res))
     }
 
-    pub(crate) fn finalize_macro_resolutions(&mut self) {
+    pub(crate) fn finalize_macro_resolutions(&mut self, krate: &Crate) {
         let check_consistency = |this: &mut Self,
                                  path: &[Segment],
                                  span,
@@ -795,7 +795,7 @@ impl<'a, 'tcx> Resolver<'a, 'tcx> {
                     let expected = kind.descr_expected();
                     let msg = format!("cannot find {} `{}` in this scope", expected, ident);
                     let mut err = self.tcx.sess.struct_span_err(ident.span, msg);
-                    self.unresolved_macro_suggestions(&mut err, kind, &parent_scope, ident);
+                    self.unresolved_macro_suggestions(&mut err, kind, &parent_scope, ident, krate);
                     err.emit();
                 }
             }

tests/ui/empty/empty-macro-use.stderr

@@ -4,8 +4,10 @@ error: cannot find macro `macro_two` in this scope
 LL |     macro_two!();
    |     ^^^^^^^^^
    |
-   = help: consider importing this macro:
-           two_macros::macro_two
+help: consider importing this macro
+   |
+LL + use two_macros::macro_two;
+   |
 
 error: aborting due to previous error
 

tests/ui/hygiene/no_implicit_prelude-2018.stderr

@@ -4,8 +4,10 @@ error: cannot find macro `print` in this scope
 LL |         print!();
    |         ^^^^^
    |
-   = help: consider importing this macro:
-           std::print
+help: consider importing this macro
+   |
+LL +     use std::print;
+   |
 
 error: aborting due to previous error
 

tests/ui/macros/issue-88228.rs

@@ -1,14 +1,14 @@
 // compile-flags: -Z deduplicate-diagnostics=yes
 // edition:2018
 
-mod hey {
+mod hey { //~ HELP consider importing this derive macro
+    //~^ HELP consider importing this macro
     pub use Copy as Bla;
     pub use std::println as bla;
 }
 
 #[derive(Bla)]
 //~^ ERROR cannot find derive macro `Bla`
-//~| HELP consider importing this derive macro
 struct A;
 
 #[derive(println)]
@@ -19,5 +19,4 @@ struct B;
 fn main() {
     bla!();
     //~^ ERROR cannot find macro `bla`
-    //~| HELP consider importing this macro
 }

tests/ui/macros/issue-88228.stderr

@@ -4,8 +4,10 @@ error: cannot find macro `bla` in this scope
 LL |     bla!();
    |     ^^^
    |
-   = help: consider importing this macro:
-           crate::hey::bla
+help: consider importing this macro
+   |
+LL + use crate::hey::bla;
+   |
 
 error: cannot find derive macro `println` in this scope
   --> $DIR/issue-88228.rs:14:10
@@ -16,13 +18,15 @@ LL | #[derive(println)]
    = note: `println` is in scope, but it is a function-like macro
 
 error: cannot find derive macro `Bla` in this scope
-  --> $DIR/issue-88228.rs:9:10
+  --> $DIR/issue-88228.rs:10:10
    |
 LL | #[derive(Bla)]
    |          ^^^
    |
-   = help: consider importing this derive macro:
-           crate::hey::Bla
+help: consider importing this derive macro
+   |
+LL + use crate::hey::Bla;
+   |
 
 error: aborting due to 3 previous errors
 

tests/ui/macros/macro-use-wrong-name.stderr

@@ -2,15 +2,21 @@ error: cannot find macro `macro_two` in this scope
   --> $DIR/macro-use-wrong-name.rs:7:5
    |
 LL |     macro_two!();
-   |     ^^^^^^^^^ help: a macro with a similar name exists: `macro_one`
+   |     ^^^^^^^^^
    |
   ::: $DIR/auxiliary/two_macros.rs:2:1
    |
 LL | macro_rules! macro_one { () => ("one") }
    | ---------------------- similarly named macro `macro_one` defined here
    |
-   = help: consider importing this macro:
-           two_macros::macro_two
+help: a macro with a similar name exists
+   |
+LL |     macro_one!();
+   |     ~~~~~~~~~
+help: consider importing this macro
+   |
+LL + use two_macros::macro_two;
+   |
 
 error: aborting due to previous error
 

tests/ui/missing/missing-macro-use.stderr

@@ -4,8 +4,10 @@ error: cannot find macro `macro_two` in this scope
 LL |     macro_two!();
    |     ^^^^^^^^^
    |
-   = help: consider importing this macro:
-           two_macros::macro_two
+help: consider importing this macro
+   |
+LL + use two_macros::macro_two;
+   |
 
 error: aborting due to previous error
 

tests/ui/proc-macro/derive-helper-shadowing.stderr

@@ -16,9 +16,11 @@ error: cannot find attribute `empty_helper` in this scope
 LL |             #[derive(GenHelperUse)]
    |                      ^^^^^^^^^^^^
    |
-   = help: consider importing this attribute macro:
-           empty_helper
    = note: this error originates in the derive macro `GenHelperUse` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: consider importing this attribute macro
+   |
+LL +             use empty_helper;
+   |
 
 error: cannot find attribute `empty_helper` in this scope
   --> $DIR/derive-helper-shadowing.rs:14:11
@@ -29,9 +31,11 @@ LL |         #[empty_helper]
 LL |             gen_helper_use!();
    |             ----------------- in this macro invocation
    |
-   = help: consider importing this attribute macro:
-           crate::empty_helper
    = note: this error originates in the macro `gen_helper_use` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: consider importing this attribute macro
+   |
+LL +             use crate::empty_helper;
+   |
 
 error[E0659]: `empty_helper` is ambiguous
   --> $DIR/derive-helper-shadowing.rs:26:13