stage2: improvements towards `zig test`

 * There is now a main_pkg in addition to root_pkg. They are usually the
   same. When using `zig test`, main_pkg is the user's source file and
   root_pkg has the test runner.
 * scanDecl no longer looks for test decls outside the package being
   tested. honoring `--test-filter` is still TODO.
 * test runner main function has a void return value rather than
   `anyerror!void`
 * Sema is improved to generate better AIR for for loops on slices.
 * Sema: fix incorrect capacity calculation in zirBoolBr
 * Sema: add compile errors for trying to use slice fields as an lvalue.
 * Sema: fix type coercion for error unions
 * Sema: fix analyzeVarRef generating garbage AIR
 * C codegen: fix renderValue for error unions with 0 bit payload
 * C codegen: implement function pointer calls
 * CLI: fix usage text

 Adds 4 new AIR instructions:

  * slice_len, slice_ptr: to get the ptr and len fields of a slice.
  * slice_elem_val, ptr_slice_elem_val: to get the element value of
    a slice, and a pointer to a slice.

AstGen gains a new functionality:

 * One of the unused flags of struct decls is now used to indicate
   structs that are known to have non-zero size based on the AST alone.

1 files changed, 2 insertions, 2 deletions

diff --git a/lib/std/special/test_runner.zig b/lib/std/special/test_runner.zig
index d78de41436..f8411c036b 100644
--- a/lib/std/special/test_runner.zig
+++ b/lib/std/special/test_runner.zig
@@ -21,9 +21,9 @@ fn processArgs() void {
     std.testing.zig_exe_path = args[1];
 }
 
-pub fn main() anyerror!void {
+pub fn main() void {
     if (builtin.zig_is_stage2) {
-        return main2();
+        return main2() catch @panic("test failure");
     }
     processArgs();
     const test_fn_list = builtin.test_functions;