Auto merge of #46073 - GuillaumeGomez:rollup, r=GuillaumeGomez

Rollup of 4 pull requests

- Successful merges: #45767, #46044, #46066, #46071
- Failed merges:

Author: bors

src/doc/rustdoc/src/documentation-tests.md

@@ -38,17 +38,19 @@ function! Forcing you to write `main` for every example, no matter how small,
 adds friction. So `rustdoc` processes your examples slightly before
 running them. Here's the full algorithm rustdoc uses to preprocess examples:
 
-1. Any leading `#![foo]` attributes are left intact as crate attributes.
-2. Some common `allow` attributes are inserted, including
+1. Some common `allow` attributes are inserted, including
    `unused_variables`, `unused_assignments`, `unused_mut`,
    `unused_attributes`, and `dead_code`. Small examples often trigger
    these lints.
-3. If the example does not contain `extern crate`, then `extern crate
+2. Any attributes specified with `#![doc(test(attr(...)))]` are added.
+3. Any leading `#![foo]` attributes are left intact as crate attributes.
+4. If the example does not contain `extern crate`, and
+   `#![doc(test(no_crate_inject))]` was not specified, then `extern crate
    <mycrate>;` is inserted (note the lack of `#[macro_use]`).
-4. Finally, if the example does not contain `fn main`, the remainder of the
+5. Finally, if the example does not contain `fn main`, the remainder of the
    text is wrapped in `fn main() { your_code }`.
 
-For more about that caveat in rule 3, see "Documeting Macros" below.
+For more about that caveat in rule 4, see "Documeting Macros" below.
 
 ## Hiding portions of the example
 
@@ -261,4 +263,4 @@ are added.
 The `no_run` attribute will compile your code, but not run it. This is
 important for examples such as "Here's how to retrieve a web page,"
 which you would want to ensure compiles, but might be run in a test
-environment that has no network access.
+environment that has no network access.

src/doc/rustdoc/src/the-doc-attribute.md

@@ -103,6 +103,26 @@ to it in the docs. But if you include this:
 
 it will not.
 
+### `test(no_crate_inject)`
+
+By default, `rustdoc` will automatically add a line with `extern crate my_crate;` into each doctest.
+But if you include this:
+
+```rust,ignore
+#![doc(test(no_crate_inject))]
+```
+
+it will not.
+
+### `test(attr(...))`
+
+This form of the `doc` attribute allows you to add arbitrary attributes to all your doctests. For
+example, if you want your doctests to fail if they produce any warnings, you could add this:
+
+```rust,ignore
+#![doc(test(attr(deny(warnings))))]
+```
+
 ## At the item level
 
 These forms of the `#[doc]` attribute are used on individual items, to control how

src/etc/indenter

@@ -13,7 +13,7 @@ while True:
     if more_re.match(line):
         indent += 1
 
-    print "%03d %s%s" % (indent, " " * indent, line.strip())
+    print("%03d %s%s" % (indent, " " * indent, line.strip()))
 
     if less_re.match(line):
         indent -= 1

src/etc/sugarise-doc-comments.py

@@ -50,11 +50,11 @@ def block_trim(s):
         lns = lns[:-1]
 
     # remove leading horizontal whitespace
-    n = sys.maxint
+    n = sys.maxsize
     for ln in lns:
         if ln.strip():
             n = min(n, len(re.search('^\s*', ln).group()))
-    if n != sys.maxint:
+    if n != sys.maxsize:
         lns = [ln[n:] for ln in lns]
 
     # strip trailing whitespace

src/etc/test-float-parse/runtests.py

@@ -97,11 +97,15 @@
 from subprocess import Popen, check_call, PIPE
 from glob import glob
 import multiprocessing
-import Queue
 import threading
 import ctypes
 import binascii
 
+try:  # Python 3
+    import queue as Queue
+except ImportError:  # Python 2
+    import Queue
+
 NUM_WORKERS = 2
 UPDATE_EVERY_N = 50000
 INF = namedtuple('INF', '')()

src/librustc/mir/mod.rs

@@ -82,9 +82,6 @@ pub struct Mir<'tcx> {
     /// in scope, but a separate set of locals.
     pub promoted: IndexVec<Promoted, Mir<'tcx>>,
 
-    /// Return type of the function.
-    pub return_ty: Ty<'tcx>,
-
     /// Yield type of the function, if it is a generator.
     pub yield_ty: Option<Ty<'tcx>>,
 
@@ -135,7 +132,6 @@ impl<'tcx> Mir<'tcx> {
                visibility_scope_info: ClearOnDecode<IndexVec<VisibilityScope,
                                                              VisibilityScopeInfo>>,
                promoted: IndexVec<Promoted, Mir<'tcx>>,
-               return_ty: Ty<'tcx>,
                yield_ty: Option<Ty<'tcx>>,
                local_decls: IndexVec<Local, LocalDecl<'tcx>>,
                arg_count: usize,
@@ -145,14 +141,12 @@ impl<'tcx> Mir<'tcx> {
         // We need `arg_count` locals, and one for the return pointer
         assert!(local_decls.len() >= arg_count + 1,
             "expected at least {} locals, got {}", arg_count + 1, local_decls.len());
-        assert_eq!(local_decls[RETURN_POINTER].ty, return_ty);
 
         Mir {
             basic_blocks,
             visibility_scopes,
             visibility_scope_info,
             promoted,
-            return_ty,
             yield_ty,
             generator_drop: None,
             generator_layout: None,
@@ -273,6 +267,11 @@ impl<'tcx> Mir<'tcx> {
             &block.terminator().source_info
         }
     }
+
+    /// Return the return type, it always return first element from `local_decls` array
+    pub fn return_ty(&self) -> Ty<'tcx> {
+        self.local_decls[RETURN_POINTER].ty
+    }
 }
 
 #[derive(Clone, Debug)]
@@ -299,7 +298,6 @@ impl_stable_hash_for!(struct Mir<'tcx> {
     visibility_scopes,
     visibility_scope_info,
     promoted,
-    return_ty,
     yield_ty,
     generator_drop,
     generator_layout,
@@ -1744,7 +1742,6 @@ impl<'tcx> TypeFoldable<'tcx> for Mir<'tcx> {
             visibility_scopes: self.visibility_scopes.clone(),
             visibility_scope_info: self.visibility_scope_info.clone(),
             promoted: self.promoted.fold_with(folder),
-            return_ty: self.return_ty.fold_with(folder),
             yield_ty: self.yield_ty.fold_with(folder),
             generator_drop: self.generator_drop.fold_with(folder),
             generator_layout: self.generator_layout.fold_with(folder),
@@ -1763,7 +1760,6 @@ impl<'tcx> TypeFoldable<'tcx> for Mir<'tcx> {
         self.generator_layout.visit_with(visitor) ||
         self.yield_ty.visit_with(visitor) ||
         self.promoted.visit_with(visitor)     ||
-        self.return_ty.visit_with(visitor)    ||
         self.local_decls.visit_with(visitor)
     }
 }

src/librustc/mir/visit.rs

@@ -292,7 +292,7 @@ macro_rules! make_mir_visitor {
                     self.visit_visibility_scope_data(scope);
                 }
 
-                self.visit_ty(&$($mutability)* mir.return_ty, TyContext::ReturnTy(SourceInfo {
+                self.visit_ty(&$($mutability)* mir.return_ty(), TyContext::ReturnTy(SourceInfo {
                     span: mir.span,
                     scope: ARGUMENT_VISIBILITY_SCOPE,
                 }));

src/librustc_mir/build/mod.rs

@@ -444,7 +444,7 @@ fn construct_fn<'a, 'gcx, 'tcx, A>(hir: Cx<'a, 'gcx, 'tcx>,
         }).collect()
     });
 
-    let mut mir = builder.finish(upvar_decls, return_ty, yield_ty);
+    let mut mir = builder.finish(upvar_decls, yield_ty);
     mir.spread_arg = spread_arg;
     mir
 }
@@ -469,7 +469,7 @@ fn construct_const<'a, 'gcx, 'tcx>(hir: Cx<'a, 'gcx, 'tcx>,
     // Constants can't `return` so a return block should not be created.
     assert_eq!(builder.cached_return_block, None);
 
-    builder.finish(vec![], ty, None)
+    builder.finish(vec![], None)
 }
 
 fn construct_error<'a, 'gcx, 'tcx>(hir: Cx<'a, 'gcx, 'tcx>,
@@ -481,7 +481,7 @@ fn construct_error<'a, 'gcx, 'tcx>(hir: Cx<'a, 'gcx, 'tcx>,
     let mut builder = Builder::new(hir, span, 0, Safety::Safe, ty);
     let source_info = builder.source_info(span);
     builder.cfg.terminate(START_BLOCK, source_info, TerminatorKind::Unreachable);
-    builder.finish(vec![], ty, None)
+    builder.finish(vec![], None)
 }
 
 impl<'a, 'gcx, 'tcx> Builder<'a, 'gcx, 'tcx> {
@@ -524,7 +524,6 @@ impl<'a, 'gcx, 'tcx> Builder<'a, 'gcx, 'tcx> {
 
     fn finish(self,
               upvar_decls: Vec<UpvarDecl>,
-              return_ty: Ty<'tcx>,
               yield_ty: Option<Ty<'tcx>>)
               -> Mir<'tcx> {
         for (index, block) in self.cfg.basic_blocks.iter().enumerate() {
@@ -537,7 +536,6 @@ impl<'a, 'gcx, 'tcx> Builder<'a, 'gcx, 'tcx> {
                  self.visibility_scopes,
                  ClearOnDecode::Set(self.visibility_scope_info),
                  IndexVec::new(),
-                 return_ty,
                  yield_ty,
                  self.local_decls,
                  self.arg_count,

src/librustc_mir/shim.rs

@@ -197,7 +197,6 @@ fn build_drop_shim<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
         ),
         ClearOnDecode::Clear,
         IndexVec::new(),
-        sig.output(),
         None,
         local_decls_for_sig(&sig, span),
         sig.inputs().len(),
@@ -345,7 +344,6 @@ impl<'a, 'tcx> CloneShimBuilder<'a, 'tcx> {
             ),
             ClearOnDecode::Clear,
             IndexVec::new(),
-            self.sig.output(),
             None,
             self.local_decls,
             self.sig.inputs().len(),
@@ -808,7 +806,6 @@ fn build_call_shim<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
         ),
         ClearOnDecode::Clear,
         IndexVec::new(),
-        sig.output(),
         None,
         local_decls,
         sig.inputs().len(),
@@ -881,7 +878,6 @@ pub fn build_adt_ctor<'a, 'gcx, 'tcx>(infcx: &infer::InferCtxt<'a, 'gcx, 'tcx>,
         ),
         ClearOnDecode::Clear,
         IndexVec::new(),
-        sig.output(),
         None,
         local_decls,
         sig.inputs().len(),

src/librustc_mir/transform/generator.rs

@@ -557,7 +557,6 @@ fn create_generator_drop_shim<'a, 'tcx>(
     }
 
     // Replace the return variable
-    mir.return_ty = tcx.mk_nil();
     mir.local_decls[RETURN_POINTER] = LocalDecl {
         mutability: Mutability::Mut,
         ty: tcx.mk_nil(),
@@ -777,7 +776,7 @@ impl MirPass for StateTransform {
         let state_did = tcx.lang_items().gen_state().unwrap();
         let state_adt_ref = tcx.adt_def(state_did);
         let state_substs = tcx.mk_substs([Kind::from(yield_ty),
-            Kind::from(mir.return_ty)].iter());
+            Kind::from(mir.return_ty())].iter());
         let ret_ty = tcx.mk_adt(state_adt_ref, state_substs);
 
         // We rename RETURN_POINTER which has type mir.return_ty to new_ret_local
@@ -808,7 +807,6 @@ impl MirPass for StateTransform {
         transform.visit_mir(mir);
 
         // Update our MIR struct to reflect the changed we've made
-        mir.return_ty = ret_ty;
         mir.yield_ty = None;
         mir.arg_count = 1;
         mir.spread_arg = None;