Rollup merge of rust-lang#56962 - nivkner:fixme_fixup4, r=pnkfelix

address some FIXME whose associated issues were marked as closed

part of rust-lang#44366

src/librustc_codegen_llvm/llvm/ffi.rs

@@ -1601,15 +1601,12 @@ extern "C" {
                                                 -> &'a Value;
     pub fn LLVMRustDIBuilderCreateOpDeref() -> i64;
     pub fn LLVMRustDIBuilderCreateOpPlusUconst() -> i64;
-}
 
-#[allow(improper_ctypes)] // FIXME(#52456) needed for RustString.
-extern "C" {
+    #[allow(improper_ctypes)]
     pub fn LLVMRustWriteTypeToString(Type: &Type, s: &RustString);
+    #[allow(improper_ctypes)]
     pub fn LLVMRustWriteValueToString(value_ref: &Value, s: &RustString);
-}
 
-extern "C" {
     pub fn LLVMIsAConstantInt(value_ref: &Value) -> Option<&Value>;
     pub fn LLVMIsAConstantFP(value_ref: &Value) -> Option<&Value>;
 
@@ -1687,56 +1684,39 @@ extern "C" {
     pub fn LLVMRustDestroyArchive(AR: &'static mut Archive);
 
     pub fn LLVMRustGetSectionName(SI: &SectionIterator, data: &mut *const c_char) -> size_t;
-}
 
-#[allow(improper_ctypes)] // FIXME(#52456) needed for RustString.
-extern "C" {
+    #[allow(improper_ctypes)]
     pub fn LLVMRustWriteTwineToString(T: &Twine, s: &RustString);
-}
 
-extern "C" {
     pub fn LLVMContextSetDiagnosticHandler(C: &Context,
                                            Handler: DiagnosticHandler,
                                            DiagnosticContext: *mut c_void);
-}
 
-#[allow(improper_ctypes)] // FIXME(#52456) needed for RustString.
-extern "C" {
+    #[allow(improper_ctypes)]
     pub fn LLVMRustUnpackOptimizationDiagnostic(DI: &'a DiagnosticInfo,
                                                 pass_name_out: &RustString,
                                                 function_out: &mut Option<&'a Value>,
                                                 loc_line_out: &mut c_uint,
                                                 loc_column_out: &mut c_uint,
                                                 loc_filename_out: &RustString,
                                                 message_out: &RustString);
-}
 
-extern "C" {
     pub fn LLVMRustUnpackInlineAsmDiagnostic(DI: &'a DiagnosticInfo,
                                              cookie_out: &mut c_uint,
                                              message_out: &mut Option<&'a Twine>,
                                              instruction_out: &mut Option<&'a Value>);
-}
 
-#[allow(improper_ctypes)] // FIXME(#52456) needed for RustString.
-extern "C" {
+    #[allow(improper_ctypes)]
     pub fn LLVMRustWriteDiagnosticInfoToString(DI: &DiagnosticInfo, s: &RustString);
-}
-
-extern "C" {
     pub fn LLVMRustGetDiagInfoKind(DI: &DiagnosticInfo) -> DiagnosticKind;
 
     pub fn LLVMRustSetInlineAsmDiagnosticHandler(C: &Context,
                                                  H: InlineAsmDiagHandler,
                                                  CX: *mut c_void);
-}
 
-#[allow(improper_ctypes)] // FIXME(#52456) needed for RustString.
-extern "C" {
+    #[allow(improper_ctypes)]
     pub fn LLVMRustWriteSMDiagnosticToString(d: &SMDiagnostic, s: &RustString);
-}
 
-extern "C" {
     pub fn LLVMRustWriteArchive(Dst: *const c_char,
                                 NumMembers: size_t,
                                 Members: *const &RustArchiveMember,

src/librustc_mir/build/matches/test.rs

@@ -347,7 +347,7 @@ impl<'a, 'gcx, 'tcx> Builder<'a, 'gcx, 'tcx> {
                             span: test.span,
                             ty: mty,
 
-                            // FIXME(#47184): This constant comes from user
+                            // FIXME(#54571): This constant comes from user
                             // input (a constant in a pattern).  Are
                             // there forms where users can add type
                             // annotations here?  For example, an

src/librustc_mir/hair/pattern/mod.rs

@@ -83,7 +83,7 @@ impl<'tcx> PatternTypeProjections<'tcx> {
     }
 
     pub(crate) fn ref_binding(&self) -> Self {
-        // FIXME(#47184): ignore for now
+        // FIXME(#55401): ignore for now
         PatternTypeProjections { contents: vec![] }
     }
 

src/librustdoc/clean/cfg.rs

@@ -10,7 +10,8 @@
 
 //! Representation of a `#[doc(cfg(...))]` attribute.
 
-// FIXME: Once RFC #1868 is implemented, switch to use those structures instead.
+// FIXME: Once the portability lint RFC is implemented (see tracking issue #41619),
+// switch to use those structures instead.
 
 use std::mem;
 use std::fmt::{self, Write};

src/librustdoc/html/render.rs

@@ -1235,10 +1235,8 @@ fn write_minify_replacer<W: Write>(dst: &mut W,
 /// static HTML tree. Each component in the cleaned path will be passed as an
 /// argument to `f`. The very last component of the path (ie the file name) will
 /// be passed to `f` if `keep_filename` is true, and ignored otherwise.
-// FIXME (#9639): The closure should deal with &[u8] instead of &str
-// FIXME (#9639): This is too conservative, rejecting non-UTF-8 paths
 fn clean_srcpath<F>(src_root: &Path, p: &Path, keep_filename: bool, mut f: F) where
-    F: FnMut(&str),
+    F: FnMut(&OsStr),
 {
     // make it relative, if possible
     let p = p.strip_prefix(src_root).unwrap_or(p);
@@ -1251,8 +1249,8 @@ fn clean_srcpath<F>(src_root: &Path, p: &Path, keep_filename: bool, mut f: F) wh
         }
 
         match c {
-            Component::ParentDir => f("up"),
-            Component::Normal(c) => f(c.to_str().unwrap()),
+            Component::ParentDir => f("up".as_ref()),
+            Component::Normal(c) => f(c),
             _ => continue,
         }
     }
@@ -1351,7 +1349,7 @@ impl<'a> SourceCollector<'a> {
             cur.push(component);
             fs::create_dir_all(&cur).unwrap();
             root_path.push_str("../");
-            href.push_str(component);
+            href.push_str(&component.to_string_lossy());
             href.push('/');
         });
         let mut fname = p.file_name()
@@ -2230,7 +2228,7 @@ impl<'a> Item<'a> {
             };
 
             clean_srcpath(&src_root, file, false, |component| {
-                path.push_str(component);
+                path.push_str(&component.to_string_lossy());
                 path.push('/');
             });
             let mut fname = file.file_name().expect("source has no filename")

src/test/auxiliary/rust_test_helpers.c

@@ -163,11 +163,7 @@ rust_get_null_ptr() {
     return 0;
 }
 
-/* Debug helpers strictly to verify ABI conformance.
- *
- * FIXME (#2665): move these into a testcase when the testsuite
- * understands how to have explicit C files included.
- */
+// Debug helpers strictly to verify ABI conformance.
 
 struct quad {
     uint64_t a;

src/test/run-pass/impl-trait/lifetimes.rs

@@ -41,7 +41,6 @@ impl<'a> SingleRegionTrait<'a> for &'a u32 {}
 struct SingleRegionStruct<'a>(&'a u32);
 
 fn simple_type_hrtb<'b>() -> impl for<'a> SingleRegionTrait<'a> { 5 }
-// FIXME(cramertj) add test after #45992 lands to ensure lint is triggered
 fn elision_single_region_trait(x: &u32) -> impl SingleRegionTrait { x }
 fn elision_single_region_struct(x: SingleRegionStruct) -> impl Into<SingleRegionStruct> { x }
 

src/test/run-pass/auxiliary/issue-31702-2.rs → src/test/run-pass/issues/auxiliary/issue-31702-2.rs

@@ -16,7 +16,7 @@ use std::collections::HashMap;
 use issue_31702_1::U256;
 
 pub struct Ethash {
-    engine_params: for<'a> fn() -> Option<&'a Vec<u8>>,
+    engine_params: fn() -> Option<&'static Vec<u8>>,
     u256_params: HashMap<String, U256>,
 }
 

src/test/run-pass/issues/issue-31702.rs

@@ -11,11 +11,6 @@
 // run-pass
 // aux-build:issue-31702-1.rs
 // aux-build:issue-31702-2.rs
-// ignore-test: FIXME(#31702) when this test was added it was thought that the
-//                            accompanying llvm update would fix it, but
-//                            unfortunately it appears that was not the case. In
-//                            the interest of not deleting the test, though,
-//                            this is just tagged with ignore-test
 
 // this test is actually entirely in the linked library crates
 

src/test/ui/borrowck/assign_mutable_fields.rs

@@ -12,7 +12,7 @@
 // var, but we do not permit you to use the complete var afterwards.
 // We hope to fix this at some point.
 //
-// FIXME(#21232)
+// FIXME(#54987)
 
 fn assign_both_fields_and_use() {
     let mut x: (u32, u32);

src/test/ui/borrowck/borrowck-describe-lvalue.ast.stderr

@@ -220,7 +220,7 @@ LL |         };
    |         - first borrow ends here
 
 error[E0499]: cannot borrow `**x` as mutable more than once at a time
-  --> $DIR/borrowck-describe-lvalue.rs:307:25
+  --> $DIR/borrowck-describe-lvalue.rs:306:25
    |
 LL |                    let y = &mut x;
    |                                 - first mutable borrow occurs here
@@ -231,7 +231,7 @@ LL |                 }
    |                 - first borrow ends here
 
 error[E0382]: use of moved value: `x`
-  --> $DIR/borrowck-describe-lvalue.rs:318:22
+  --> $DIR/borrowck-describe-lvalue.rs:317:22
    |
 LL |                 drop(x);
    |                      - value moved here

src/test/ui/borrowck/borrowck-describe-lvalue.mir.stderr

@@ -10,7 +10,7 @@ LL |             *y = 1;
    |             ------ first borrow later used here
 
 error[E0499]: cannot borrow `x` as mutable more than once at a time
-  --> $DIR/borrowck-describe-lvalue.rs:307:20
+  --> $DIR/borrowck-describe-lvalue.rs:306:20
    |
 LL |                    let y = &mut x;
    |                            ------ first mutable borrow occurs here
@@ -21,7 +21,7 @@ LL |                    *y = 1;
    |                    ------ first borrow later used here
 
 error: captured variable cannot escape `FnMut` closure body
-  --> $DIR/borrowck-describe-lvalue.rs:305:16
+  --> $DIR/borrowck-describe-lvalue.rs:304:16
    |
 LL |              || {
    |               - inferred to be a `FnMut` closure
@@ -362,7 +362,7 @@ LL |             drop(x);
    |                  - mutable borrow later used here
 
 error[E0382]: use of moved value: `x`
-  --> $DIR/borrowck-describe-lvalue.rs:318:22
+  --> $DIR/borrowck-describe-lvalue.rs:317:22
    |
 LL |                 drop(x);
    |                      - value moved here

src/test/ui/borrowck/borrowck-describe-lvalue.rs

@@ -299,7 +299,6 @@ fn main() {
     }
     // Field from upvar nested
     {
-        // FIXME(#49824) -- the free region error below should probably not be there
         let mut x = 0;
            || {
                || { //[mir]~ ERROR captured variable cannot escape `FnMut` closure body

src/test/ui/issues/issue-36082.ast.stderr

@@ -1,5 +1,5 @@
 error[E0597]: borrowed value does not live long enough
-  --> $DIR/issue-36082.rs:23:19
+  --> $DIR/issue-36082.rs:21:19
    |
 LL |     let val: &_ = x.borrow().0;
    |                   ^^^^^^^^^^  - temporary value dropped here while still borrowed

src/test/ui/issues/issue-36082.mir.stderr

@@ -1,5 +1,5 @@
 error[E0716]: temporary value dropped while borrowed
-  --> $DIR/issue-36082.rs:23:19
+  --> $DIR/issue-36082.rs:21:19
    |
 LL |     let val: &_ = x.borrow().0;
    |                   ^^^^^^^^^^  - temporary value is freed at the end of this statement

src/test/ui/issues/issue-36082.rs

@@ -11,8 +11,6 @@
 // revisions: ast mir
 //[mir]compile-flags: -Z borrowck=mir
 
-// FIXME(#49821) -- No tip about using a let binding
-
 use std::cell::RefCell;
 
 fn main() {

src/test/ui/nll/closure-requirements/propagate-approximated-shorter-to-static-no-bound.rs

@@ -12,9 +12,6 @@
 // approximate the shorter end-point (`'y`) to with `'static`. This is
 // because `'y` is higher-ranked but we know of no relations to other
 // regions. Note that `'static` shows up in the stderr output as `'0`.
-//
-// FIXME(#45827) Because of shortcomings in the MIR type checker,
-// these errors are not (yet) reported.
 
 // compile-flags:-Zborrowck=mir -Zverbose
 

src/test/ui/nll/closure-requirements/propagate-approximated-shorter-to-static-no-bound.stderr

@@ -1,5 +1,5 @@
 note: External requirements
-  --> $DIR/propagate-approximated-shorter-to-static-no-bound.rs:45:47
+  --> $DIR/propagate-approximated-shorter-to-static-no-bound.rs:42:47
    |
 LL |       establish_relationships(&cell_a, &cell_b, |_outlives, x, y| {
    |  _______________________________________________^
@@ -20,7 +20,7 @@ LL | |     });
    = note: where '_#1r: '_#0r
 
 note: No external requirements
-  --> $DIR/propagate-approximated-shorter-to-static-no-bound.rs:44:1
+  --> $DIR/propagate-approximated-shorter-to-static-no-bound.rs:41:1
    |
 LL | / fn supply<'a, 'b>(cell_a: Cell<&'a u32>, cell_b: Cell<&'b u32>) {
 LL | |     establish_relationships(&cell_a, &cell_b, |_outlives, x, y| {
@@ -34,7 +34,7 @@ LL | | }
    = note: defining type: DefId(0/0:6 ~ propagate_approximated_shorter_to_static_no_bound[317d]::supply[0]) with substs []
 
 error[E0521]: borrowed data escapes outside of function
-  --> $DIR/propagate-approximated-shorter-to-static-no-bound.rs:45:5
+  --> $DIR/propagate-approximated-shorter-to-static-no-bound.rs:42:5
    |
 LL |   fn supply<'a, 'b>(cell_a: Cell<&'a u32>, cell_b: Cell<&'b u32>) {
    |                     ------ `cell_a` is a reference that is only valid in the function body

src/test/ui/nll/closure-requirements/propagate-approximated-shorter-to-static-wrong-bound.rs

@@ -13,9 +13,6 @@
 // because `'y` is higher-ranked but we know of only irrelevant
 // relations to other regions. Note that `'static` shows up in the
 // stderr output as `'0`.
-//
-// FIXME(#45827) Because of shortcomings in the MIR type checker,
-// these errors are not (yet) reported.
 
 // compile-flags:-Zborrowck=mir -Zverbose
 

src/test/ui/nll/closure-requirements/propagate-approximated-shorter-to-static-wrong-bound.stderr

@@ -1,5 +1,5 @@
 note: External requirements
-  --> $DIR/propagate-approximated-shorter-to-static-wrong-bound.rs:48:47
+  --> $DIR/propagate-approximated-shorter-to-static-wrong-bound.rs:45:47
    |
 LL |       establish_relationships(&cell_a, &cell_b, |_outlives1, _outlives2, x, y| {
    |  _______________________________________________^
@@ -20,7 +20,7 @@ LL | |     });
    = note: where '_#1r: '_#0r
 
 note: No external requirements
-  --> $DIR/propagate-approximated-shorter-to-static-wrong-bound.rs:47:1
+  --> $DIR/propagate-approximated-shorter-to-static-wrong-bound.rs:44:1
    |
 LL | / fn supply<'a, 'b>(cell_a: Cell<&'a u32>, cell_b: Cell<&'b u32>) {
 LL | |     establish_relationships(&cell_a, &cell_b, |_outlives1, _outlives2, x, y| {
@@ -34,7 +34,7 @@ LL | | }
    = note: defining type: DefId(0/0:6 ~ propagate_approximated_shorter_to_static_wrong_bound[317d]::supply[0]) with substs []
 
 error[E0521]: borrowed data escapes outside of function
-  --> $DIR/propagate-approximated-shorter-to-static-wrong-bound.rs:48:5
+  --> $DIR/propagate-approximated-shorter-to-static-wrong-bound.rs:45:5
    |
 LL |   fn supply<'a, 'b>(cell_a: Cell<&'a u32>, cell_b: Cell<&'b u32>) {
    |                     ------ `cell_a` is a reference that is only valid in the function body