merge(3p/git): Merge git subtree at v2.29.2 r/1890

This also bumps the stable nixpkgs to 20.09 as of 2020-11-21, because
there is some breakage in the git build related to the netrc
credentials helper which someone has taken care of in nixpkgs.

The stable channel is not used for anything other than git, so this
should be fine.

Change-Id: I3575a19dab09e1e9556cf8231d717de9890484fb

38 files changed, 297 insertions, 0 deletions

diff --git a/third_party/git/t/t4018/dts-labels b/third_party/git/t/t4018/dts-labels
new file mode 100644
index 000000000000..b21ef8737bb8
--- /dev/null
+++ b/third_party/git/t/t4018/dts-labels
@@ -0,0 +1,9 @@
+/ {
+	label_1: node1@ff00 {
+		label2: RIGHT {
+			vendor,some-property;
+
+			ChangeMe = <0x45-30>;
+		};
+	};
+};
diff --git a/third_party/git/t/t4018/dts-node-unitless b/third_party/git/t/t4018/dts-node-unitless
new file mode 100644
index 000000000000..c5287d91416e
--- /dev/null
+++ b/third_party/git/t/t4018/dts-node-unitless
@@ -0,0 +1,8 @@
+/ {
+	label_1: node1 {
+		RIGHT {
+			prop-array = <1>, <4>;
+			ChangeMe = <0xffeedd00>;
+		};
+	};
+};
diff --git a/third_party/git/t/t4018/dts-nodes b/third_party/git/t/t4018/dts-nodes
new file mode 100644
index 000000000000..5a4334bb1645
--- /dev/null
+++ b/third_party/git/t/t4018/dts-nodes
@@ -0,0 +1,8 @@
+/ {
+	label_1: node1@ff00 {
+		RIGHT@deadf00,4000 {
+			#size-cells = <1>;
+			ChangeMe = <0xffeedd00>;
+		};
+	};
+};
diff --git a/third_party/git/t/t4018/dts-nodes-boolean-prop b/third_party/git/t/t4018/dts-nodes-boolean-prop
new file mode 100644
index 000000000000..afc6b5b404e4
--- /dev/null
+++ b/third_party/git/t/t4018/dts-nodes-boolean-prop
@@ -0,0 +1,9 @@
+/ {
+	label_1: node1@ff00 {
+		RIGHT@deadf00,4000 {
+			boolean-prop1;
+
+			ChangeMe;
+		};
+	};
+};
diff --git a/third_party/git/t/t4018/dts-nodes-comment1 b/third_party/git/t/t4018/dts-nodes-comment1
new file mode 100644
index 000000000000..559dfce9b308
--- /dev/null
+++ b/third_party/git/t/t4018/dts-nodes-comment1
@@ -0,0 +1,8 @@
+/ {
+	label_1: node1@ff00 {
+		RIGHT@deadf00,4000 /* &a comment */ {
+			#size-cells = <1>;
+			ChangeMe = <0xffeedd00>;
+		};
+	};
+};
diff --git a/third_party/git/t/t4018/dts-nodes-comment2 b/third_party/git/t/t4018/dts-nodes-comment2
new file mode 100644
index 000000000000..27e9718b31cf
--- /dev/null
+++ b/third_party/git/t/t4018/dts-nodes-comment2
@@ -0,0 +1,8 @@
+/ {
+	label_1: node1@ff00 {
+		RIGHT@deadf00,4000 { /* a trailing comment */ 
+			#size-cells = <1>;
+			ChangeMe = <0xffeedd00>;
+		};
+	};
+};
diff --git a/third_party/git/t/t4018/dts-nodes-multiline-prop b/third_party/git/t/t4018/dts-nodes-multiline-prop
new file mode 100644
index 000000000000..072d58b69dc2
--- /dev/null
+++ b/third_party/git/t/t4018/dts-nodes-multiline-prop
@@ -0,0 +1,13 @@
+/ {
+	label_1: node1@ff00 {
+		RIGHT@deadf00,4000 {
+			multilineprop = <3>,
+					<4>,
+					<5>,
+					<6>,
+					<7>;
+
+			ChangeMe = <0xffeedd00>;
+		};
+	};
+};
diff --git a/third_party/git/t/t4018/dts-reference b/third_party/git/t/t4018/dts-reference
new file mode 100644
index 000000000000..8f0c87d8637f
--- /dev/null
+++ b/third_party/git/t/t4018/dts-reference
@@ -0,0 +1,9 @@
+&label_1 {
+	TEST = <455>;
+};
+
+&RIGHT {
+	vendor,some-property;
+
+	ChangeMe = <0x45-30>;
+};
diff --git a/third_party/git/t/t4018/dts-root b/third_party/git/t/t4018/dts-root
new file mode 100644
index 000000000000..4353b8220c91
--- /dev/null
+++ b/third_party/git/t/t4018/dts-root
@@ -0,0 +1,5 @@
+/ { RIGHT /* Technically just supposed to be a slash and brace */
+	#size-cells = <1>;
+
+	ChangeMe = <0xffeedd00>;
+};
diff --git a/third_party/git/t/t4018/dts-root-comment b/third_party/git/t/t4018/dts-root-comment
new file mode 100644
index 000000000000..333a625c7007
--- /dev/null
+++ b/third_party/git/t/t4018/dts-root-comment
@@ -0,0 +1,8 @@
+/ { RIGHT /* Technically just supposed to be a slash and brace */
+	#size-cells = <1>;
+
+	/* This comment should be ignored */
+
+	some-property = <40+2>;
+	ChangeMe = <0xffeedd00>;
+};
diff --git a/third_party/git/t/t4018/elixir-do-not-pick-end b/third_party/git/t/t4018/elixir-do-not-pick-end
new file mode 100644
index 000000000000..fae08ba7e8cb
--- /dev/null
+++ b/third_party/git/t/t4018/elixir-do-not-pick-end
@@ -0,0 +1,5 @@
+defmodule RIGHT do
+end
+#
+#
+# ChangeMe; do not pick up 'end' line
diff --git a/third_party/git/t/t4018/elixir-ex-unit-test b/third_party/git/t/t4018/elixir-ex-unit-test
new file mode 100644
index 000000000000..0560a2b69718
--- /dev/null
+++ b/third_party/git/t/t4018/elixir-ex-unit-test
@@ -0,0 +1,6 @@
+defmodule Test do
+  test "RIGHT" do
+    assert true == true
+    assert ChangeMe
+  end
+end
diff --git a/third_party/git/t/t4018/elixir-function b/third_party/git/t/t4018/elixir-function
new file mode 100644
index 000000000000..d452f495a7e0
--- /dev/null
+++ b/third_party/git/t/t4018/elixir-function
@@ -0,0 +1,5 @@
+def function(RIGHT, arg) do
+  # comment
+  # comment
+  ChangeMe
+end
diff --git a/third_party/git/t/t4018/elixir-macro b/third_party/git/t/t4018/elixir-macro
new file mode 100644
index 000000000000..4f925e9ad463
--- /dev/null
+++ b/third_party/git/t/t4018/elixir-macro
@@ -0,0 +1,5 @@
+defmacro foo(RIGHT) do
+  # Code
+  # Code
+  ChangeMe
+end
diff --git a/third_party/git/t/t4018/elixir-module b/third_party/git/t/t4018/elixir-module
new file mode 100644
index 000000000000..91a4e7aa2000
--- /dev/null
+++ b/third_party/git/t/t4018/elixir-module
@@ -0,0 +1,9 @@
+defmodule RIGHT do
+  @moduledoc """
+  Foo bar
+  """
+
+  def ChangeMe(a) where is_map(a) do
+    a
+  end
+end
diff --git a/third_party/git/t/t4018/elixir-module-func b/third_party/git/t/t4018/elixir-module-func
new file mode 100644
index 000000000000..c9910d067513
--- /dev/null
+++ b/third_party/git/t/t4018/elixir-module-func
@@ -0,0 +1,8 @@
+defmodule Foo do
+  def fun(RIGHT) do
+     # Code
+     # Code
+     # Code
+     ChangeMe
+  end
+end
diff --git a/third_party/git/t/t4018/elixir-nested-module b/third_party/git/t/t4018/elixir-nested-module
new file mode 100644
index 000000000000..771ebc5c42a9
--- /dev/null
+++ b/third_party/git/t/t4018/elixir-nested-module
@@ -0,0 +1,9 @@
+defmodule MyApp.RIGHT do
+  @moduledoc """
+  Foo bar
+  """
+
+  def ChangeMe(a) where is_map(a) do
+    a
+  end
+end
diff --git a/third_party/git/t/t4018/elixir-private-function b/third_party/git/t/t4018/elixir-private-function
new file mode 100644
index 000000000000..1aabe33b7a9a
--- /dev/null
+++ b/third_party/git/t/t4018/elixir-private-function
@@ -0,0 +1,5 @@
+defp function(RIGHT, arg) do
+  # comment
+  # comment
+  ChangeMe
+end
diff --git a/third_party/git/t/t4018/elixir-protocol b/third_party/git/t/t4018/elixir-protocol
new file mode 100644
index 000000000000..7d9173691e32
--- /dev/null
+++ b/third_party/git/t/t4018/elixir-protocol
@@ -0,0 +1,6 @@
+defprotocol RIGHT do
+  @doc """
+  Calculates the size (and not the length!) of a data structure
+  """
+  def size(data, ChangeMe)
+end
diff --git a/third_party/git/t/t4018/elixir-protocol-implementation b/third_party/git/t/t4018/elixir-protocol-implementation
new file mode 100644
index 000000000000..f9234bbfc489
--- /dev/null
+++ b/third_party/git/t/t4018/elixir-protocol-implementation
@@ -0,0 +1,5 @@
+defimpl RIGHT do
+  # Docs
+  # Docs
+  def foo(ChangeMe), do: :ok
+end
diff --git a/third_party/git/t/t4018/fortran-block-data b/third_party/git/t/t4018/fortran-block-data
new file mode 100644
index 000000000000..63d4e21d0ad1
--- /dev/null
+++ b/third_party/git/t/t4018/fortran-block-data
@@ -0,0 +1,5 @@
+       BLOCK DATA RIGHT
+       
+       COMMON /B/ C, ChangeMe
+       DATA C, ChangeMe  / 2.0, 6.0 / 
+       END 
diff --git a/third_party/git/t/t4018/fortran-comment b/third_party/git/t/t4018/fortran-comment
new file mode 100644
index 000000000000..7b10d1765885
--- /dev/null
+++ b/third_party/git/t/t4018/fortran-comment
@@ -0,0 +1,13 @@
+      module a
+
+      contains
+
+      ! subroutine wrong
+      subroutine RIGHT
+      ! subroutine wrong
+
+      real ChangeMe
+
+      end subroutine RIGHT
+
+      end module a
diff --git a/third_party/git/t/t4018/fortran-comment-keyword b/third_party/git/t/t4018/fortran-comment-keyword
new file mode 100644
index 000000000000..e9206a53799d
--- /dev/null
+++ b/third_party/git/t/t4018/fortran-comment-keyword
@@ -0,0 +1,14 @@
+      module a
+
+      contains
+
+      subroutine RIGHT (funcA, funcB)
+
+      real funcA  ! grid function a
+      real funcB  ! grid function b
+
+      real ChangeMe
+
+      end subroutine RIGHT
+
+      end module a
diff --git a/third_party/git/t/t4018/fortran-comment-legacy b/third_party/git/t/t4018/fortran-comment-legacy
new file mode 100644
index 000000000000..53cd062c1e5f
--- /dev/null
+++ b/third_party/git/t/t4018/fortran-comment-legacy
@@ -0,0 +1,13 @@
+      module a
+
+      contains
+
+C subroutine wrong
+      subroutine RIGHT
+C subroutine wrong
+
+      real ChangeMe
+
+      end subroutine RIGHT
+
+      end module a
diff --git a/third_party/git/t/t4018/fortran-comment-legacy-star b/third_party/git/t/t4018/fortran-comment-legacy-star
new file mode 100644
index 000000000000..2cbcdc3d8ab9
--- /dev/null
+++ b/third_party/git/t/t4018/fortran-comment-legacy-star
@@ -0,0 +1,13 @@
+      module a
+
+      contains
+
+* subroutine wrong
+      subroutine RIGHT
+* subroutine wrong
+
+      real ChangeMe
+
+      end subroutine RIGHT
+
+      end module a
diff --git a/third_party/git/t/t4018/fortran-external-function b/third_party/git/t/t4018/fortran-external-function
new file mode 100644
index 000000000000..5a2d85d3aa41
--- /dev/null
+++ b/third_party/git/t/t4018/fortran-external-function
@@ -0,0 +1,9 @@
+function RIGHT(a, b) result(c)
+
+integer, intent(in) :: ChangeMe
+integer, intent(in) :: b
+integer, intent(out) :: c
+
+c = a+b
+
+end function RIGHT
diff --git a/third_party/git/t/t4018/fortran-external-subroutine b/third_party/git/t/t4018/fortran-external-subroutine
new file mode 100644
index 000000000000..4ce85fea1324
--- /dev/null
+++ b/third_party/git/t/t4018/fortran-external-subroutine
@@ -0,0 +1,5 @@
+subroutine RIGHT
+
+real ChangeMe
+
+end subroutine RIGHT
diff --git a/third_party/git/t/t4018/fortran-module b/third_party/git/t/t4018/fortran-module
new file mode 100644
index 000000000000..c4b737dac3f1
--- /dev/null
+++ b/third_party/git/t/t4018/fortran-module
@@ -0,0 +1,5 @@
+module RIGHT
+
+use ChangeMe
+
+end module RIGHT
diff --git a/third_party/git/t/t4018/fortran-module-procedure b/third_party/git/t/t4018/fortran-module-procedure
new file mode 100644
index 000000000000..1ce6d854c22b
--- /dev/null
+++ b/third_party/git/t/t4018/fortran-module-procedure
@@ -0,0 +1,13 @@
+ module RIGHT
+
+   implicit none
+   private
+
+   interface letters  ! generic interface
+      module procedure aaaa, &
+                       bbbb, &
+                       ChangeMe, &
+                       dddd
+   end interface
+   
+end module RIGHT
diff --git a/third_party/git/t/t4018/fortran-program b/third_party/git/t/t4018/fortran-program
new file mode 100644
index 000000000000..4616895e4b56
--- /dev/null
+++ b/third_party/git/t/t4018/fortran-program
@@ -0,0 +1,5 @@
+program RIGHT
+
+call ChangeMe
+
+end program RIGHT
diff --git a/third_party/git/t/t4018/markdown-heading-indented b/third_party/git/t/t4018/markdown-heading-indented
new file mode 100644
index 000000000000..1991c2bd4569
--- /dev/null
+++ b/third_party/git/t/t4018/markdown-heading-indented
@@ -0,0 +1,6 @@
+Indented headings are allowed, as long as the indent is no more than 3 spaces.
+
+   ### RIGHT
+
+- something
+- ChangeMe
diff --git a/third_party/git/t/t4018/markdown-heading-non-headings b/third_party/git/t/t4018/markdown-heading-non-headings
new file mode 100644
index 000000000000..c479c1a3f1e2
--- /dev/null
+++ b/third_party/git/t/t4018/markdown-heading-non-headings
@@ -0,0 +1,17 @@
+Headings can be right next to other lines of the file:
+# RIGHT
+Indents of four or more spaces make a code block:
+
+    # code comment, not heading
+
+If there's no space after the final hash, it's not a heading:
+
+#hashtag
+
+Sequences of more than 6 hashes don't make a heading:
+
+####### over-enthusiastic heading
+
+So the detected heading should be right up at the start of this file.
+
+ChangeMe
diff --git a/third_party/git/t/t4018/python-async-def b/third_party/git/t/t4018/python-async-def
new file mode 100644
index 000000000000..87640e03d213
--- /dev/null
+++ b/third_party/git/t/t4018/python-async-def
@@ -0,0 +1,4 @@
+async def RIGHT(pi: int = 3.14):
+    while True:
+        break
+    return ChangeMe()
diff --git a/third_party/git/t/t4018/python-class b/third_party/git/t/t4018/python-class
new file mode 100644
index 000000000000..ba9e741430f2
--- /dev/null
+++ b/third_party/git/t/t4018/python-class
@@ -0,0 +1,4 @@
+class RIGHT(int, str):
+    # comment
+    # another comment
+    # ChangeMe
diff --git a/third_party/git/t/t4018/python-def b/third_party/git/t/t4018/python-def
new file mode 100644
index 000000000000..e50b31b0ad5e
--- /dev/null
+++ b/third_party/git/t/t4018/python-def
@@ -0,0 +1,4 @@
+def RIGHT(pi: int = 3.14):
+    while True:
+        break
+    return ChangeMe()
diff --git a/third_party/git/t/t4018/python-indented-async-def b/third_party/git/t/t4018/python-indented-async-def
new file mode 100644
index 000000000000..f5d03258af4d
--- /dev/null
+++ b/third_party/git/t/t4018/python-indented-async-def
@@ -0,0 +1,7 @@
+class Foo:
+    async def RIGHT(self, x: int):
+        return [
+            1,
+            2,
+            ChangeMe,
+        ]
diff --git a/third_party/git/t/t4018/python-indented-class b/third_party/git/t/t4018/python-indented-class
new file mode 100644
index 000000000000..19b4f35c4ca1
--- /dev/null
+++ b/third_party/git/t/t4018/python-indented-class
@@ -0,0 +1,5 @@
+if TYPE_CHECKING:
+    class RIGHT:
+        # comment
+        # another comment
+        # ChangeMe
diff --git a/third_party/git/t/t4018/python-indented-def b/third_party/git/t/t4018/python-indented-def
new file mode 100644
index 000000000000..208fbadd2be6
--- /dev/null
+++ b/third_party/git/t/t4018/python-indented-def
@@ -0,0 +1,7 @@
+class Foo:
+    def RIGHT(self, x: int):
+        return [
+            1,
+            2,
+            ChangeMe,
+        ]