Explicitly export core and std macros

Currently all core and std macros are automatically added to the prelude
via #[macro_use]. However a situation arose where we want to add a new macro
`assert_matches` but don't want to pull it into the standard prelude for
compatibility reasons. By explicitly exporting the macros found in the core and
std crates we get to decide on a per macro basis and can later add them via
the rust_20xx preludes.

tests/pretty/asm.pp

@@ -1,6 +1,5 @@
 #![feature(prelude_import)]
 #![no_std]
-#[macro_use]
 extern crate std;
 #[prelude_import]
 use ::std::prelude::rust_2015::*;

tests/pretty/autodiff/autodiff_forward.pp

@@ -3,7 +3,6 @@
 //@ only-nightly
 
 #![feature(autodiff)]
-#[macro_use]
 extern crate std;
 #[prelude_import]
 use ::std::prelude::rust_2015::*;

tests/pretty/autodiff/autodiff_reverse.pp

@@ -3,7 +3,6 @@
 //@ only-nightly
 
 #![feature(autodiff)]
-#[macro_use]
 extern crate std;
 #[prelude_import]
 use ::std::prelude::rust_2015::*;

tests/pretty/autodiff/inherent_impl.pp

@@ -3,7 +3,6 @@
 //@ only-nightly
 
 #![feature(autodiff)]
-#[macro_use]
 extern crate std;
 #[prelude_import]
 use ::std::prelude::rust_2015::*;

tests/pretty/cast-lt.pp

@@ -1,6 +1,5 @@
 #![feature(prelude_import)]
 #![no_std]
-#[macro_use]
 extern crate std;
 #[prelude_import]
 use ::std::prelude::rust_2015::*;

tests/pretty/delegation-impl-reuse.pp

@@ -6,7 +6,6 @@
 
 #![allow(incomplete_features)]
 #![feature(fn_delegation)]
-#[macro_use]
 extern crate std;
 #[prelude_import]
 use ::std::prelude::rust_2015::*;

tests/pretty/delegation-inherit-attributes.pp

@@ -6,7 +6,6 @@
 
 #![allow(incomplete_features)]
 #![feature(fn_delegation)]
-#[attr = MacroUse {arguments: UseAll}]
 extern crate std;
 #[prelude_import]
 use std::prelude::rust_2021::*;

tests/pretty/delegation-inline-attribute.pp

@@ -4,7 +4,6 @@
 
 #![allow(incomplete_features)]
 #![feature(fn_delegation)]
-#[attr = MacroUse {arguments: UseAll}]
 extern crate std;
 #[prelude_import]
 use ::std::prelude::rust_2015::*;

tests/pretty/dollar-crate.pp

@@ -1,6 +1,5 @@
 #![feature(prelude_import)]
 #![no_std]
-#[macro_use]
 extern crate std;
 #[prelude_import]
 use ::std::prelude::rust_2015::*;

tests/pretty/expanded-and-path-remap-80832.pp

@@ -1,6 +1,5 @@
 #![feature(prelude_import)]
 #![no_std]
-#[macro_use]
 extern crate std;
 #[prelude_import]
 use ::std::prelude::rust_2015::*;

tests/pretty/format-args-str-escape.pp

@@ -1,6 +1,5 @@
 #![feature(prelude_import)]
 #![no_std]
-#[macro_use]
 extern crate std;
 #[prelude_import]
 use ::std::prelude::rust_2015::*;

tests/pretty/hir-delegation.pp

@@ -4,7 +4,6 @@
 
 #![allow(incomplete_features)]
 #![feature(fn_delegation)]
-#[attr = MacroUse {arguments: UseAll}]
 extern crate std;
 #[prelude_import]
 use ::std::prelude::rust_2015::*;

tests/pretty/hir-fn-params.pp

@@ -1,4 +1,3 @@
-#[attr = MacroUse {arguments: UseAll}]
 extern crate std;
 #[prelude_import]
 use ::std::prelude::rust_2015::*;

tests/pretty/hir-fn-variadic.pp

@@ -3,7 +3,6 @@
 //@ pp-exact:hir-fn-variadic.pp
 
 #![feature(c_variadic)]
-#[attr = MacroUse {arguments: UseAll}]
 extern crate std;
 #[prelude_import]
 use ::std::prelude::rust_2015::*;

tests/pretty/hir-if-else.pp

@@ -1,4 +1,3 @@
-#[attr = MacroUse {arguments: UseAll}]
 extern crate std;
 #[prelude_import]
 use ::std::prelude::rust_2015::*;

tests/pretty/hir-lifetimes.pp

@@ -5,7 +5,6 @@
 // This tests the pretty-printing of lifetimes in lots of ways.
 
 #![allow(unused)]
-#[attr = MacroUse {arguments: UseAll}]
 extern crate std;
 #[prelude_import]
 use ::std::prelude::rust_2015::*;

tests/pretty/hir-pretty-attr.pp

@@ -1,4 +1,3 @@
-#[attr = MacroUse {arguments: UseAll}]
 extern crate std;
 #[prelude_import]
 use ::std::prelude::rust_2015::*;

tests/pretty/hir-pretty-loop.pp

@@ -1,4 +1,3 @@
-#[attr = MacroUse {arguments: UseAll}]
 extern crate std;
 #[prelude_import]
 use ::std::prelude::rust_2015::*;

tests/pretty/hir-struct-expr.pp

@@ -1,4 +1,3 @@
-#[attr = MacroUse {arguments: UseAll}]
 extern crate std;
 #[prelude_import]
 use ::std::prelude::rust_2015::*;

tests/pretty/if-else.pp

@@ -1,6 +1,5 @@
 #![feature(prelude_import)]
 #![no_std]
-#[macro_use]
 extern crate std;
 #[prelude_import]
 use ::std::prelude::rust_2015::*;

tests/pretty/issue-12590-c.pp

@@ -1,6 +1,5 @@
 #![feature(prelude_import)]
 #![no_std]
-#[macro_use]
 extern crate std;
 #[prelude_import]
 use ::std::prelude::rust_2015::*;

tests/pretty/issue-4264.pp

@@ -1,4 +1,3 @@
-#[attr = MacroUse {arguments: UseAll}]
 extern crate std;
 #[prelude_import]
 use ::std::prelude::rust_2015::*;

tests/pretty/issue-85089.pp

@@ -1,4 +1,3 @@
-#[attr = MacroUse {arguments: UseAll}]
 extern crate std;
 #[prelude_import]
 use ::std::prelude::rust_2015::*;

tests/pretty/never-pattern.pp

@@ -7,7 +7,6 @@
 #![allow(incomplete_features)]
 #![feature(never_patterns)]
 #![feature(never_type)]
-#[macro_use]
 extern crate std;
 #[prelude_import]
 use ::std::prelude::rust_2015::*;

tests/pretty/pin-ergonomics-hir.pp

@@ -4,7 +4,6 @@
 
 #![feature(pin_ergonomics)]
 #![allow(dead_code, incomplete_features)]
-#[attr = MacroUse {arguments: UseAll}]
 extern crate std;
 #[prelude_import]
 use ::std::prelude::rust_2015::*;

tests/pretty/postfix-match/precedence.pp

@@ -1,7 +1,6 @@
 #![feature(prelude_import)]
 #![no_std]
 #![feature(postfix_match)]
-#[macro_use]
 extern crate std;
 #[prelude_import]
 use ::std::prelude::rust_2015::*;

tests/pretty/shebang-at-top.pp

@@ -1,7 +1,6 @@
 #!/usr/bin/env rust
 #![feature(prelude_import)]
 #![no_std]
-#[macro_use]
 extern crate std;
 #[prelude_import]
 use ::std::prelude::rust_2015::*;

tests/pretty/tests-are-sorted.pp

@@ -1,6 +1,5 @@
 #![feature(prelude_import)]
 #![no_std]
-#[macro_use]
 extern crate std;
 #[prelude_import]
 use ::std::prelude::rust_2015::*;