Remove fallback to parent modules from lexical resolution

src/test/ui-fulldeps/proc-macro/auxiliary/generate-mod.rs

@@ -20,9 +20,35 @@ use proc_macro::*;
 #[proc_macro]
 pub fn check(_: TokenStream) -> TokenStream {
     "
+    type Alias = FromOutside; // OK
     struct Outer;
     mod inner {
+        type Alias = FromOutside; // `FromOutside` shouldn't be available from here
         type Inner = Outer; // `Outer` shouldn't be available from here
     }
     ".parse().unwrap()
 }
+
+#[proc_macro_attribute]
+pub fn check_attr(_: TokenStream, _: TokenStream) -> TokenStream {
+    "
+    type AliasAttr = FromOutside; // OK
+    struct OuterAttr;
+    mod inner_attr {
+        type Alias = FromOutside; // `FromOutside` shouldn't be available from here
+        type Inner = OuterAttr; // `OuterAttr` shouldn't be available from here
+    }
+    ".parse().unwrap()
+}
+
+#[proc_macro_derive(CheckDerive)]
+pub fn check_derive(_: TokenStream) -> TokenStream {
+    "
+    type AliasDerive = FromOutside; // OK
+    struct OuterDerive;
+    mod inner_derive {
+        type Alias = FromOutside; // `FromOutside` shouldn't be available from here
+        type Inner = OuterDerive; // `OuterDerive` shouldn't be available from here
+    }
+    ".parse().unwrap()
+}

src/test/ui-fulldeps/proc-macro/generate-mod.rs

@@ -12,10 +12,23 @@
 
 // aux-build:generate-mod.rs
 
-#![feature(proc_macro, proc_macro_gen)]
+#![feature(proc_macro, proc_macro_gen, proc_macro_path_invoc)]
 
 extern crate generate_mod;
 
-generate_mod::check!(); //~ ERROR cannot find type `Outer` in this scope
+struct FromOutside;
+
+generate_mod::check!(); //~ ERROR cannot find type `FromOutside` in this scope
+                        //~| ERROR cannot find type `Outer` in this scope
+
+#[generate_mod::check_attr] //~ ERROR cannot find type `FromOutside` in this scope
+                            //~| ERROR cannot find type `OuterAttr` in this scope
+struct S;
+
+#[derive(generate_mod::CheckDerive)] //~ WARN cannot find type `FromOutside` in this scope
+                                     //~| WARN cannot find type `OuterDerive` in this scope
+                                     //~| WARN this was previously accepted
+                                     //~| WARN this was previously accepted
+struct Z;
 
 fn main() {}

src/test/ui-fulldeps/proc-macro/generate-mod.stderr

@@ -1,9 +1,46 @@
-error[E0412]: cannot find type `Outer` in this scope
-  --> $DIR/generate-mod.rs:19:1
+error[E0412]: cannot find type `FromOutside` in this scope
+  --> $DIR/generate-mod.rs:21:1
    |
-LL | generate_mod::check!(); //~ ERROR cannot find type `Outer` in this scope
+LL | generate_mod::check!(); //~ ERROR cannot find type `FromOutside` in this scope
    | ^^^^^^^^^^^^^^^^^^^^^^^ not found in this scope
 
-error: aborting due to previous error
+error[E0412]: cannot find type `Outer` in this scope
+  --> $DIR/generate-mod.rs:21:1
+   |
+LL | generate_mod::check!(); //~ ERROR cannot find type `FromOutside` in this scope
+   | ^^^^^^^^^^^^^^^^^^^^^^^ not found in this scope
+
+error[E0412]: cannot find type `FromOutside` in this scope
+  --> $DIR/generate-mod.rs:24:1
+   |
+LL | #[generate_mod::check_attr] //~ ERROR cannot find type `FromOutside` in this scope
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ not found in this scope
+
+error[E0412]: cannot find type `OuterAttr` in this scope
+  --> $DIR/generate-mod.rs:24:1
+   |
+LL | #[generate_mod::check_attr] //~ ERROR cannot find type `FromOutside` in this scope
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^ not found in this scope
+
+warning: cannot find type `FromOutside` in this scope
+  --> $DIR/generate-mod.rs:28:10
+   |
+LL | #[derive(generate_mod::CheckDerive)] //~ WARN cannot find type `FromOutside` in this scope
+   |          ^^^^^^^^^^^^^^^^^^^^^^^^^ names from parent modules are not accessible without an explicit import
+   |
+   = note: #[warn(proc_macro_derive_resolution_fallback)] on by default
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #50504 <https://github.com/rust-lang/rust/issues/50504>
+
+warning: cannot find type `OuterDerive` in this scope
+  --> $DIR/generate-mod.rs:28:10
+   |
+LL | #[derive(generate_mod::CheckDerive)] //~ WARN cannot find type `FromOutside` in this scope
+   |          ^^^^^^^^^^^^^^^^^^^^^^^^^ names from parent modules are not accessible without an explicit import
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #50504 <https://github.com/rust-lang/rust/issues/50504>
+
+error: aborting due to 4 previous errors
 
 For more information about this error, try `rustc --explain E0412`.

src/test/ui/hygiene/arguments.rs

@@ -23,5 +23,5 @@ macro m($t:ty, $e:expr) {
 
 fn main() {
     struct S;
-    m!(S, S);
+    m!(S, S); //~ ERROR cannot find type `S` in this scope
 }

src/test/ui/hygiene/arguments.stderr

@@ -0,0 +1,9 @@
+error[E0412]: cannot find type `S` in this scope
+  --> $DIR/arguments.rs:26:8
+   |
+LL |     m!(S, S); //~ ERROR cannot find type `S` in this scope
+   |        ^ not found in this scope
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0412`.

src/test/ui/hygiene/generate-mod.rs

@@ -12,13 +12,46 @@
 
 #![feature(decl_macro, rustc_attrs)]
 
-#[rustc_transparent_macro]
-macro genmod() {
-    mod m {
-        type A = S; //~ ERROR cannot find type `S` in this scope
+macro genmod($FromOutside: ident, $Outer: ident) {
+    type A = $FromOutside;
+    struct $Outer;
+    mod inner {
+        type A = $FromOutside; // `FromOutside` shouldn't be available from here
+        type Inner = $Outer; // `Outer` shouldn't be available from here
     }
 }
 
-struct S;
+#[rustc_transparent_macro]
+macro genmod_transparent() {
+    type A = FromOutside;
+    struct Outer;
+    mod inner {
+        type A = FromOutside; //~ ERROR cannot find type `FromOutside` in this scope
+        type Inner = Outer; //~ ERROR cannot find type `Outer` in this scope
+    }
+}
 
-genmod!();
+macro_rules! genmod_legacy { () => {
+    type A = FromOutside;
+    struct Outer;
+    mod inner {
+        type A = FromOutside; //~ ERROR cannot find type `FromOutside` in this scope
+        type Inner = Outer; //~ ERROR cannot find type `Outer` in this scope
+    }
+}}
+
+fn check() {
+    struct FromOutside;
+    genmod!(FromOutside, Outer); //~ ERROR cannot find type `FromOutside` in this scope
+                                 //~| ERROR cannot find type `Outer` in this scope
+}
+
+fn check_transparent() {
+    struct FromOutside;
+    genmod_transparent!();
+}
+
+fn check_legacy() {
+    struct FromOutside;
+    genmod_legacy!();
+}

src/test/ui/hygiene/generate-mod.stderr

@@ -1,17 +1,56 @@
-error[E0412]: cannot find type `S` in this scope
-  --> $DIR/generate-mod.rs:18:18
+error[E0412]: cannot find type `FromOutside` in this scope
+  --> $DIR/generate-mod.rs:45:13
    |
-LL |         type A = S; //~ ERROR cannot find type `S` in this scope
-   |                  ^ did you mean `A`?
+LL |     genmod!(FromOutside, Outer); //~ ERROR cannot find type `FromOutside` in this scope
+   |             ^^^^^^^^^^^ not found in this scope
+
+error[E0412]: cannot find type `Outer` in this scope
+  --> $DIR/generate-mod.rs:45:26
+   |
+LL |     genmod!(FromOutside, Outer); //~ ERROR cannot find type `FromOutside` in this scope
+   |                          ^^^^^ not found in this scope
+
+error[E0412]: cannot find type `FromOutside` in this scope
+  --> $DIR/generate-mod.rs:29:18
+   |
+LL |         type A = FromOutside; //~ ERROR cannot find type `FromOutside` in this scope
+   |                  ^^^^^^^^^^^ not found in this scope
 ...
-LL | genmod!();
-   | ---------- in this macro invocation
+LL |     genmod_transparent!();
+   |     ---------------------- in this macro invocation
+
+error[E0412]: cannot find type `Outer` in this scope
+  --> $DIR/generate-mod.rs:30:22
+   |
+LL |         type Inner = Outer; //~ ERROR cannot find type `Outer` in this scope
+   |                      ^^^^^ not found in this scope
+...
+LL |     genmod_transparent!();
+   |     ---------------------- in this macro invocation
+
+error[E0412]: cannot find type `FromOutside` in this scope
+  --> $DIR/generate-mod.rs:38:18
+   |
+LL |         type A = FromOutside; //~ ERROR cannot find type `FromOutside` in this scope
+   |                  ^^^^^^^^^^^ not found in this scope
+...
+LL |     genmod_legacy!();
+   |     ----------------- in this macro invocation
+
+error[E0412]: cannot find type `Outer` in this scope
+  --> $DIR/generate-mod.rs:39:22
+   |
+LL |         type Inner = Outer; //~ ERROR cannot find type `Outer` in this scope
+   |                      ^^^^^ not found in this scope
+...
+LL |     genmod_legacy!();
+   |     ----------------- in this macro invocation
 
 error[E0601]: `main` function not found in crate `generate_mod`
    |
    = note: consider adding a `main` function to `$DIR/generate-mod.rs`
 
-error: aborting due to 2 previous errors
+error: aborting due to 7 previous errors
 
 Some errors occurred: E0412, E0601.
 For more information about an error, try `rustc --explain E0412`.

src/test/ui/hygiene/globs.rs

@@ -57,12 +57,26 @@ macro n($i:ident) {
                 }
             }
         }
+        macro n_with_super($j:ident) {
+            mod test {
+                use super::*;
+                fn g() {
+                    let _: u32 = $i();
+                    let _: () = f();
+                    super::$j();
+                }
+            }
+        }
 
-        n!(f);
+        n!(f); //~ ERROR cannot find function `f` in this scope
+        n_with_super!(f);
         mod test2 {
             super::n! {
                 f //~ ERROR cannot find function `f` in this scope
             }
+            super::n_with_super! {
+                f
+            }
         }
     }
 }

src/test/ui/hygiene/globs.stderr

@@ -30,13 +30,23 @@ LL | use bar::g;
    |
 LL | use foo::test2::test::g;
    |
-LL | use foo::test::g;
+LL | use foo::test2::test::g;
    |
 LL | use foo::test::g;
    |
+and 2 other candidates
 
 error[E0425]: cannot find function `f` in this scope
-  --> $DIR/globs.rs:64:17
+  --> $DIR/globs.rs:71:12
+   |
+LL | n!(f);
+   | ------ in this macro invocation
+...
+LL |         n!(f); //~ ERROR cannot find function `f` in this scope
+   |            ^ not found in this scope
+
+error[E0425]: cannot find function `f` in this scope
+  --> $DIR/globs.rs:75:17
    |
 LL | n!(f);
    | ------ in this macro invocation
@@ -44,6 +54,6 @@ LL | n!(f);
 LL |                 f //~ ERROR cannot find function `f` in this scope
    |                 ^ not found in this scope
 
-error: aborting due to 3 previous errors
+error: aborting due to 4 previous errors
 
 For more information about this error, try `rustc --explain E0425`.