fix std hover, full capture terminator, bare static calls, void main in run-only images

- hover: a symbol from an embedded library source (tinyvm:std.zc, tinyvm:icon.zc) was
  looked up only in the document; look it up by its qualified name in the library source
  (hover_embedded_sym), and render a method found that way by its line (bs_hover).
- std.capture: allocate one word more than the 256 it holds, so end() terminates inside the buffer.
- a bare call to a static function of the enclosing struct resolves like a bare struct constant
  (mstruct is set for every non-generic struct's methods); the struct's own wins over a global.
- run.zc declares main untyped (fn main();), so a run-only image accepts int, void or untyped main
  with both compilers.

1 files changed, 8 insertions, 0 deletions

diff --git a/tests/programs/void_main.zc b/tests/programs/void_main.zc
new file mode 100644
index 0000000..b4fde70
--- /dev/null
+++ b/tests/programs/void_main.zc
@@ -0,0 +1,8 @@
+namespace;
+include rt;
+
+// main may be declared void: the runtime ignores what main returns (docs/SPEC.md 5.2.5, 8.1.3),
+// so a run-only image, whose run.zc declares int main();, accepts it as zy does.
+void main() {
+	rt.put_s("void main"); rt.put_c(10);
+}