d: Merge upstream dmd, druntime e4f8919591, phobos 3ad507b51.

D front-end changes:

    - Import dmd v2.101.0-beta.1.
    - Add predefined version `D_Optimized' when compiling with `-O'.
    - Shortened method syntax (DIP1043) is now enabled by default.
    - Array literals assigned to `scope' array variables are now
      allocated on the stack.
    - Implement `@system' variables (DIP1035), available behind the
      preview feature flag `-fpreview=systemvariables'.

D runtime changes:

    - Import druntime v2.101.0-beta.1.

Phobos changes:

    - Import phobos v2.101.0-beta.1.
    - Added `std.typecons.SafeRefCounted', that can be used in `@safe'
      code with `-fpreview=dip1000'.

gcc/d/ChangeLog:

	* d-attribs.cc (apply_user_attributes): Update for new front-end
	interface.
	* d-builtins.cc (d_init_versions): Predefine `D_Optimized' with
	compiling with optimizations enabled.
	* d-lang.cc (d_handle_option): Update for new front-end interface.
	Handle new option `-fpreview=systemvariables'.
	* dmd/MERGE: Merge upstream dmd e4f8919591.
	* dmd/VERSION: Bump version to v2.101.0-beta.1.
	* expr.cc (ExprVisitor::visit (AssignExp *)): Treat construction of
	static arrays from a call expression as a simple assignment.
	(ExprVisitor::visit (ArrayLiteralExp *)): Handle array literals with
	`scope' storage.
	* gdc.texi: Update documentation of `-fpreview=' options.
	* lang.opt (fpreview=shortenedmethods): Remove.
	(fpreview=systemvariables):  New option.

libphobos/ChangeLog:

	* libdruntime/MERGE: Merge upstream druntime e4f8919591.
	* src/MERGE: Merge upstream phobos 3ad507b51.

gcc/testsuite/ChangeLog:

	* gdc.dg/simd19630.d: Move tests with errors to ...
	* gdc.dg/simd19630b.d: ... here.  New test.
	* gdc.dg/simd19630c.d: New test.
	* gdc.dg/simd_ctfe.d: Removed.
	* gdc.dg/simd18867.d: New test.
	* gdc.dg/simd19788.d: New test.
	* gdc.dg/simd21469.d: New test.
	* gdc.dg/simd21672.d: New test.
	* gdc.dg/simd23077.d: New test.
	* gdc.dg/simd23084.d: New test.
	* gdc.dg/simd23085.d: New test.
	* gdc.dg/torture/simd19632.d: New test.
	* gdc.dg/torture/simd20041.d: New test.
	* gdc.dg/torture/simd21673.d: New test.
	* gdc.dg/torture/simd21676.d: New test.
	* gdc.dg/torture/simd22438.d: New test.
	* gdc.dg/torture/simd23009.d: New test.
	* gdc.dg/torture/simd23077.d: New test.
	* gdc.dg/torture/simd8.d: New test.
	* gdc.dg/torture/simd9.d: New test.
	* gdc.dg/torture/simd_prefetch.d: New test.

2 files changed, 25 insertions, 1 deletions

diff --git a/libphobos/src/std/algorithm/iteration.d b/libphobos/src/std/algorithm/iteration.d
index 39eff0d..9a365d5 100644
--- a/libphobos/src/std/algorithm/iteration.d
+++ b/libphobos/src/std/algorithm/iteration.d
@@ -7926,7 +7926,13 @@ if (isRandomAccessRange!Range && hasLength!Range)
         _indices = iota(size_t(r.length)).array;
         _empty = r.length == 0;
     }
-
+    private this(size_t[] indices, size_t[] state, Range r, bool empty_)
+    {
+        _indices = indices;
+        _state = state;
+        _r = r;
+        _empty = empty_;
+    }
     /// Returns: `true` if the range is empty, `false` otherwise.
     @property bool empty() const pure nothrow @safe @nogc
     {
@@ -7967,6 +7973,11 @@ if (isRandomAccessRange!Range && hasLength!Range)
 
         next(2);
     }
+    /// Returns: an independent copy of the permutations range.
+    auto save()
+    {
+        return typeof(this)(_indices.dup, _state.dup, _r.save, _empty);
+    }
 }
 
 ///
@@ -7982,3 +7993,15 @@ if (isRandomAccessRange!Range && hasLength!Range)
          [1, 2, 0],
          [2, 1, 0]]));
 }
+
+@safe unittest
+{
+    import std.algorithm.comparison : equal;
+    import std.range : ElementType;
+    import std.array : array;
+    auto p = [1, 2, 3].permutations;
+    auto x = p.save.front;
+    p.popFront;
+    auto y = p.front;
+    assert(x != y);
+}
diff --git a/libphobos/src/std/algorithm/mutation.d b/libphobos/src/std/algorithm/mutation.d
index b0e7707..839183d 100644
--- a/libphobos/src/std/algorithm/mutation.d
+++ b/libphobos/src/std/algorithm/mutation.d
@@ -1943,6 +1943,7 @@ if (Offset.length >= 1 && allSatisfy!(isValidIntegralTuple, Offset))
     return removeImpl!s(range, offset);
 }
 
+/// ditto
 deprecated("Use of non-integral tuples is deprecated. Use remove(tuple(start, end).")
 Range remove
 (SwapStrategy s = SwapStrategy.stable, Range, Offset ...)