un-special-case startup code in the std lib

Previously, the compiler had special logic to determine whether to
include the startup code, which was in `std/special/start.zig`. Now,
the file is moved to `std/start.zig`, and there is no special logic
in the compiler. Instead, the standard library unconditionally imports
the `start.zig` file, which then has a `comptime` block that does the
logic of determining what, if any, start symbols to export. Instead of
`start.zig` being in its own special package, it is just another normal
file that is part of the standard library.

`std.builtin.TestFn` is now part of the standard library rather than
specially generated by the compiler.

1 files changed, 7 insertions, 0 deletions

diff --git a/lib/std/builtin.zig b/lib/std/builtin.zig
index 5b7051eafb..687e169bbe 100644
--- a/lib/std/builtin.zig
+++ b/lib/std/builtin.zig
@@ -414,6 +414,13 @@ pub const CallOptions = struct {
 
 /// This function type is used by the Zig language code generation and
 /// therefore must be kept in sync with the compiler implementation.
+pub const TestFn = struct {
+    name: []const u8,
+    func: fn()anyerror!void,
+};
+
+/// This function type is used by the Zig language code generation and
+/// therefore must be kept in sync with the compiler implementation.
 pub const PanicFn = fn ([]const u8, ?*StackTrace) noreturn;
 
 /// This function is used by the Zig language code generation and