Add empty main() to tests where it is missing.

src/test/ui/error-codes/E0522.rs

@@ -15,3 +15,5 @@ fn cookie() -> ! {
 //~^^ ERROR definition of an unknown language item: `cookie` [E0522]
     loop {}
 }
+
+fn main() {}

src/test/ui/error-codes/E0522.stderr

@@ -1,12 +1,9 @@
-error[E0601]: main function not found in crate E0522
-
 error[E0522]: definition of an unknown language item: `cookie`
   --> $DIR/E0522.rs:13:1
    |
 LL | #[lang = "cookie"]
    | ^^^^^^^^^^^^^^^^^^ definition of unknown language item `cookie`
 
-error: aborting due to 2 previous errors
+error: aborting due to previous error
 
-Some errors occurred: E0522, E0601.
-For more information about an error, try `rustc --explain E0522`.
+For more information about this error, try `rustc --explain E0522`.

src/test/ui/feature-gate-i128_type2.rs

@@ -30,3 +30,5 @@ fn test3_2() {
 enum A { //~ ERROR 128-bit type is unstable
     A(u64)
 }
+
+fn main() {}

src/test/ui/feature-gate-i128_type2.stderr

@@ -30,8 +30,6 @@ LL |     let x: u128 = 0; //~ ERROR 128-bit type is unstable
    |
    = help: add #![feature(i128_type)] to the crate attributes to enable
 
-error[E0601]: main function not found in crate feature_gate_i128_type2
-
 error[E0658]: repr with 128-bit type is unstable (see issue #35118)
   --> $DIR/feature-gate-i128_type2.rs:30:1
    |
@@ -42,7 +40,6 @@ LL | | }
    |
    = help: add #![feature(repr128)] to the crate attributes to enable
 
-error: aborting due to 6 previous errors
+error: aborting due to 5 previous errors
 
-Some errors occurred: E0601, E0658.
-For more information about an error, try `rustc --explain E0601`.
+For more information about this error, try `rustc --explain E0658`.

src/test/ui/feature-gate/issue-43106-gating-of-inline.rs

@@ -35,3 +35,5 @@ mod inline {
     #[inline = "2100"] impl S { }
     //~^ ERROR attribute should be applied to function
 }
+
+fn main() {}

src/test/ui/feature-gate/issue-43106-gating-of-inline.stderr

@@ -1,5 +1,3 @@
-error[E0601]: main function not found in crate issue_43106_gating_of_inline
-
 error[E0518]: attribute should be applied to function
   --> $DIR/issue-43106-gating-of-inline.rs:21:1
    |
@@ -39,7 +37,6 @@ error[E0518]: attribute should be applied to function
 LL |     #[inline = "2100"] impl S { }
    |     ^^^^^^^^^^^^^^^^^^ ---------- not a function
 
-error: aborting due to 6 previous errors
+error: aborting due to 5 previous errors
 
-Some errors occurred: E0518, E0601.
-For more information about an error, try `rustc --explain E0518`.
+For more information about this error, try `rustc --explain E0518`.

src/test/ui/feature-gate/issue-43106-gating-of-macro_escape.rs

@@ -13,5 +13,9 @@
 // `#![macro_escape]` is incompatible with crate-level `#![macro_use]`
 // already present in issue-43106-gating-of-builtin-attrs.
 
+// must-compile-successfully
+
 #![macro_escape]
 //~^ WARN macro_escape is a deprecated synonym for macro_use
+
+fn main() {}

src/test/ui/feature-gate/issue-43106-gating-of-macro_escape.stderr

@@ -1,13 +1,8 @@
 warning: macro_escape is a deprecated synonym for macro_use
-  --> $DIR/issue-43106-gating-of-macro_escape.rs:16:1
+  --> $DIR/issue-43106-gating-of-macro_escape.rs:18:1
    |
 LL | #![macro_escape]
    | ^^^^^^^^^^^^^^^^
    |
    = help: consider an outer attribute, #[macro_use] mod ...
 
-error[E0601]: main function not found in crate issue_43106_gating_of_macro_escape
-
-error: aborting due to previous error
-
-For more information about this error, try `rustc --explain E0601`.

src/test/ui/feature-gate/issue-43106-gating-of-proc_macro_derive.rs

@@ -40,3 +40,5 @@ mod proc_macro_derive2 {
     #[proc_macro_derive = "2500"] impl S { }
     //~^ ERROR the `#[proc_macro_derive]` attribute may only be used on bare functions
 }
+
+fn main() {}

src/test/ui/feature-gate/issue-43106-gating-of-proc_macro_derive.stderr

@@ -34,8 +34,5 @@ error: the `#[proc_macro_derive]` attribute may only be used on bare functions
 LL |     #[proc_macro_derive = "2500"] impl S { }
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-error[E0601]: main function not found in crate issue_43106_gating_of_proc_macro_derive
+error: aborting due to 6 previous errors
 
-error: aborting due to 7 previous errors
-
-For more information about this error, try `rustc --explain E0601`.

src/test/ui/feature-gate/issue-43106-gating-of-rustc_deprecated.rs

@@ -36,3 +36,4 @@ mod rustc_deprecated {
     //~^ ERROR stability attributes may not be used outside of the standard library
 }
 
+fn main() {}

src/test/ui/feature-gate/issue-43106-gating-of-rustc_deprecated.stderr

@@ -1,5 +1,3 @@
-error[E0601]: main function not found in crate issue_43106_gating_of_rustc_deprecated
-
 error: stability attributes may not be used outside of the standard library
   --> $DIR/issue-43106-gating-of-rustc_deprecated.rs:17:1
    |
@@ -42,6 +40,5 @@ error: stability attributes may not be used outside of the standard library
 LL |     #[rustc_deprecated = "1500"] impl S { }
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-error: aborting due to 8 previous errors
+error: aborting due to 7 previous errors
 
-For more information about this error, try `rustc --explain E0601`.

src/test/ui/feature-gate/issue-43106-gating-of-stable.rs

@@ -35,3 +35,5 @@ mod stable {
     #[stable = "1300"] impl S { }
     //~^ ERROR stability attributes may not be used outside of the standard library
 }
+
+fn main() {}

src/test/ui/feature-gate/issue-43106-gating-of-stable.stderr

@@ -1,5 +1,3 @@
-error[E0601]: main function not found in crate issue_43106_gating_of_stable
-
 error: stability attributes may not be used outside of the standard library
   --> $DIR/issue-43106-gating-of-stable.rs:17:1
    |
@@ -42,6 +40,5 @@ error: stability attributes may not be used outside of the standard library
 LL |     #[stable = "1300"] impl S { }
    |     ^^^^^^^^^^^^^^^^^^
 
-error: aborting due to 8 previous errors
+error: aborting due to 7 previous errors
 
-For more information about this error, try `rustc --explain E0601`.

src/test/ui/feature-gate/issue-43106-gating-of-unstable.rs

@@ -35,3 +35,5 @@ mod unstable {
     #[unstable = "1200"] impl S { }
     //~^ ERROR stability attributes may not be used outside of the standard library
 }
+
+fn main() {}

src/test/ui/feature-gate/issue-43106-gating-of-unstable.stderr

@@ -1,5 +1,3 @@
-error[E0601]: main function not found in crate issue_43106_gating_of_unstable
-
 error: stability attributes may not be used outside of the standard library
   --> $DIR/issue-43106-gating-of-unstable.rs:17:1
    |
@@ -42,6 +40,5 @@ error: stability attributes may not be used outside of the standard library
 LL |     #[unstable = "1200"] impl S { }
    |     ^^^^^^^^^^^^^^^^^^^^
 
-error: aborting due to 8 previous errors
+error: aborting due to 7 previous errors
 
-For more information about this error, try `rustc --explain E0601`.

src/test/ui/generator/yield-in-const.rs

@@ -12,3 +12,5 @@
 
 const A: u8 = { yield 3u8; 3u8};
 //~^ ERROR yield statement outside
+
+fn main() {}

src/test/ui/generator/yield-in-const.stderr

@@ -1,12 +1,9 @@
-error[E0601]: main function not found in crate yield_in_const
-
 error[E0627]: yield statement outside of generator literal
   --> $DIR/yield-in-const.rs:13:17
    |
 LL | const A: u8 = { yield 3u8; 3u8};
    |                 ^^^^^^^^^
 
-error: aborting due to 2 previous errors
+error: aborting due to previous error
 
-Some errors occurred: E0601, E0627.
-For more information about an error, try `rustc --explain E0601`.
+For more information about this error, try `rustc --explain E0627`.

src/test/ui/generator/yield-in-static.rs

@@ -12,3 +12,5 @@
 
 static B: u8 = { yield 3u8; 3u8};
 //~^ ERROR yield statement outside
+
+fn main() {}

src/test/ui/generator/yield-in-static.stderr

@@ -1,12 +1,9 @@
-error[E0601]: main function not found in crate yield_in_static
-
 error[E0627]: yield statement outside of generator literal
   --> $DIR/yield-in-static.rs:13:18
    |
 LL | static B: u8 = { yield 3u8; 3u8};
    |                  ^^^^^^^^^
 
-error: aborting due to 2 previous errors
+error: aborting due to previous error
 
-Some errors occurred: E0601, E0627.
-For more information about an error, try `rustc --explain E0601`.
+For more information about this error, try `rustc --explain E0627`.

src/test/ui/imports/macro-paths.rs

@@ -36,3 +36,5 @@ fn g() {
         mod baz { pub use two_macros::m; }
     }
 }
+
+fn main() {}

src/test/ui/imports/macro-paths.stderr

@@ -36,9 +36,6 @@ LL | | }
    | |_^
    = note: macro-expanded items do not shadow when used in a macro invocation path
 
-error[E0601]: main function not found in crate macro_paths
+error: aborting due to 2 previous errors
 
-error: aborting due to 3 previous errors
-
-Some errors occurred: E0601, E0659.
-For more information about an error, try `rustc --explain E0601`.
+For more information about this error, try `rustc --explain E0659`.

src/test/ui/imports/macros.rs

@@ -49,3 +49,5 @@ mod m4 {
     use two_macros::m;
     m!(); //~ ERROR ambiguous
 }
+
+fn main() {}

src/test/ui/imports/macros.stderr

@@ -51,9 +51,6 @@ LL |     use two_macros::m;
    |         ^^^^^^^^^^^^^
    = note: macro-expanded macro imports do not shadow
 
-error[E0601]: main function not found in crate macros
+error: aborting due to 3 previous errors
 
-error: aborting due to 4 previous errors
-
-Some errors occurred: E0601, E0659.
-For more information about an error, try `rustc --explain E0601`.
+For more information about this error, try `rustc --explain E0659`.

src/test/ui/in-band-lifetimes/mismatched_trait_impl-2.rs

@@ -20,3 +20,5 @@ impl Deref for Struct {
     }
 }
 //~^^^^ ERROR cannot infer an appropriate lifetime for lifetime parameter
+
+fn main() {}

src/test/ui/in-band-lifetimes/mismatched_trait_impl-2.stderr

@@ -1,5 +1,3 @@
-error[E0601]: main function not found in crate mismatched_trait_impl_2
-
 error[E0495]: cannot infer an appropriate lifetime for lifetime parameter in generic type due to conflicting requirements
   --> $DIR/mismatched_trait_impl-2.rs:18:5
    |
@@ -18,7 +16,6 @@ LL | |     }
            expected fn(&Struct) -> &Trait + 'static
               found fn(&Struct) -> &Trait
 
-error: aborting due to 2 previous errors
+error: aborting due to previous error
 
-Some errors occurred: E0495, E0601.
-For more information about an error, try `rustc --explain E0495`.
+For more information about this error, try `rustc --explain E0495`.

src/test/ui/issue-47706-trait.rs

@@ -14,3 +14,5 @@ trait T {
     }
     //~^^ ERROR function is expected to take a single 0-tuple as argument
 }
+
+fn main() {}

src/test/ui/issue-47706-trait.stderr

@@ -1,5 +1,3 @@
-error[E0601]: main function not found in crate issue_47706_trait
-
 error[E0593]: function is expected to take a single 0-tuple as argument, but it takes 2 distinct arguments
   --> $DIR/issue-47706-trait.rs:13:20
    |
@@ -8,7 +6,6 @@ LL |     fn f(&self, _: ()) {
 LL |         None::<()>.map(Self::f);
    |                    ^^^ expected function that takes a single 0-tuple as argument
 
-error: aborting due to 2 previous errors
+error: aborting due to previous error
 
-Some errors occurred: E0593, E0601.
-For more information about an error, try `rustc --explain E0593`.
+For more information about this error, try `rustc --explain E0593`.

src/test/ui/missing-items/m2.rs

@@ -18,3 +18,5 @@ struct X {
 
 impl m1::X for X { //~ ERROR not all trait items implemented
 }
+
+fn main() {}

src/test/ui/missing-items/m2.stderr

@@ -1,5 +1,3 @@
-error[E0601]: main function not found in crate m2
-
 error[E0046]: not all trait items implemented, missing: `CONSTANT`, `Type`, `method`
   --> $DIR/m2.rs:19:1
    |
@@ -10,7 +8,6 @@ LL | impl m1::X for X { //~ ERROR not all trait items implemented
    = note: `Type` from trait: `type Type;`
    = note: `method` from trait: `fn(&Self, std::string::String) -> <Self as m1::X>::Type`
 
-error: aborting due to 2 previous errors
+error: aborting due to previous error
 
-Some errors occurred: E0046, E0601.
-For more information about an error, try `rustc --explain E0046`.
+For more information about this error, try `rustc --explain E0046`.

src/test/ui/resolve/issue-14254.rs

@@ -111,3 +111,5 @@ impl Foo for Box<isize> {
         //~^ ERROR cannot find value `bah`
     }
 }
+
+fn main() {}

src/test/ui/resolve/issue-14254.stderr

@@ -142,9 +142,6 @@ error[E0425]: cannot find value `bah` in this scope
 LL |         bah;
    |         ^^^ help: try: `Self::bah`
 
-error[E0601]: main function not found in crate issue_14254
+error: aborting due to 24 previous errors
 
-error: aborting due to 25 previous errors
-
-Some errors occurred: E0425, E0601.
-For more information about an error, try `rustc --explain E0425`.
+For more information about this error, try `rustc --explain E0425`.

src/test/ui/resolve/issue-21221-2.rs

@@ -27,3 +27,5 @@ pub mod baz {
 struct Foo;
 impl T for Foo { }
 //~^ ERROR cannot find trait `T`
+
+fn main() {}

src/test/ui/resolve/issue-21221-2.stderr

@@ -8,7 +8,5 @@ help: possible candidate is found in another module, you can import it into scop
 LL | use foo::bar::T;
    |
 
-error[E0601]: main function not found in crate issue_21221_2
-
 error: cannot continue compilation due to previous error
 

src/test/ui/resolve/suggest-path-instead-of-mod-dot-item.rs

@@ -65,3 +65,5 @@ fn h8() -> i32 {
     a::b()
     //~^ ERROR expected function, found module `a::b`
 }
+
+fn main() {}

src/test/ui/resolve/suggest-path-instead-of-mod-dot-item.stderr

@@ -72,9 +72,6 @@ LL |     a::b()
    |        |
    |        did you mean `I`?
 
-error[E0601]: main function not found in crate suggest_path_instead_of_mod_dot_item
+error: aborting due to 9 previous errors
 
-error: aborting due to 10 previous errors
-
-Some errors occurred: E0423, E0601.
-For more information about an error, try `rustc --explain E0423`.
+For more information about this error, try `rustc --explain E0423`.

src/test/ui/span/issue-35987.rs

@@ -20,3 +20,5 @@ impl<T: Clone, Add> Add for Foo<T> {
         unimplemented!();
     }
 }
+
+fn main() {}

src/test/ui/span/issue-35987.stderr

@@ -8,7 +8,5 @@ help: possible better candidate is found in another module, you can import it in
 LL | use std::ops::Add;
    |
 
-error[E0601]: main function not found in crate issue_35987
-
 error: cannot continue compilation due to previous error
 

src/test/ui/token/issue-10636-2.rs

@@ -17,3 +17,5 @@ pub fn trace_option(option: Option<isize>) {
 
 } //~ ERROR: incorrect close delimiter
 //~^ ERROR: expected expression, found `)`
+
+fn main() {}

src/test/ui/token/issue-10636-2.stderr

@@ -22,8 +22,5 @@ error: expected expression, found `)`
 LL | } //~ ERROR: incorrect close delimiter
    | ^ expected expression
 
-error[E0601]: main function not found in crate issue_10636_2
+error: aborting due to 3 previous errors
 
-error: aborting due to 4 previous errors
-
-For more information about this error, try `rustc --explain E0601`.

src/test/ui/token/issue-41155.rs

@@ -11,3 +11,5 @@
 impl S { //~ ERROR cannot find type
     pub
 } //~ ERROR expected one of
+
+fn main() {}

src/test/ui/token/issue-41155.stderr

@@ -12,9 +12,6 @@ error[E0412]: cannot find type `S` in this scope
 LL | impl S { //~ ERROR cannot find type
    |      ^ not found in this scope
 
-error[E0601]: main function not found in crate issue_41155
+error: aborting due to 2 previous errors
 
-error: aborting due to 3 previous errors
-
-Some errors occurred: E0412, E0601.
-For more information about an error, try `rustc --explain E0412`.
+For more information about this error, try `rustc --explain E0412`.