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.

2 files changed, 14 insertions, 0 deletions

diff --git a/tests/drivers/lsp_test.js b/tests/drivers/lsp_test.js
index 0f4abe1..2ad9181 100644
--- a/tests/drivers/lsp_test.js
+++ b/tests/drivers/lsp_test.js
@@ -199,6 +199,18 @@ const tmsrc = 'struct point {\n\tlet x;\n\t// the sum of the parts\n\tint sum(in
 hv = hover(tmsrc, 7, at(tmsrc, 7, 'sum'));
 check(hv && hv.includes('int sum(int k)') && hv.includes('the sum of the parts'), 'a typed method shows its return type and parameters', hv);
 
+// members of the embedded standard library hover like the document's own: the group's static
+// function, the group, and a top-level function, each with the comment from std.zc
+const stdsrc = 'include rt, std;\nfn main() { char[24] b; rt.put_s(std.Text.itoa(5, b)); return std.array_contains; }\n';
+hv = hover(stdsrc, 1, at(stdsrc, 1, 'itoa'));
+check(hv && hv.includes('static int itoa(int n, char* dst)') && hv.includes('writes n in decimal into dst'), 'hover on a std group function shows its signature and doc from std.zc', hv);
+hv = hover(stdsrc, 1, at(stdsrc, 1, 'Text'));
+check(hv && hv.includes('struct Text') && hv.includes('helpers for char* strings'), 'hover on a std group shows the comment of the group', hv);
+hv = hover(stdsrc, 1, at(stdsrc, 1, 'array_contains'));
+check(hv && hv.includes('array_contains<T>') && hv.includes('true when an element equals value'), 'hover on a top-level std function shows its doc', hv);
+hv = hover(stdsrc, 1, at(stdsrc, 1, 'put_s'));
+check(hv && hv.includes('int put_s(char* s)'), 'hover on a runtime function still works beside the std ones', hv);
+
 // externs are declarations, so they draw no "never reassigned" hint
 const ext = 'extern double sqrt(double);\nextern double pow(double x, double y);\nfn main() {\n\treturn 0;\n}\n';
 r = run([init(1), open(A, ext)]);
diff --git a/tests/drivers/runtime_image_test.py b/tests/drivers/runtime_image_test.py
index d214613..6c44349 100644
--- a/tests/drivers/runtime_image_test.py
+++ b/tests/drivers/runtime_image_test.py
@@ -18,6 +18,8 @@ cases = [
     ('enhancements', 'include rt; fn main() { rt.put_n(17 % 5); rt.put_c(32); rt.put_n(17 / 5); }', b'2 3'),
     ('array algorithms', Path('examples/learn/31-array-algorithms.zc').read_text(), Path('examples/learn/31-array-algorithms.out').read_bytes()),
     ('owned pop', 'include rt; int*.u take() { int*[?] a = rt.new(int*[?]); int* p = rt.new(int); *p = 8; a.push(p); return a.pop(); } fn main() { let p = take(); rt.put_n(rt.isobj(p)); rt.put_c(32); rt.put_n(*p); }', b'1 8'),
+    # main may be void: run.zc's prototype of main must not fix its type (docs/SPEC.md 5.2.5)
+    ('void main', Path('tests/programs/void_main.zc').read_text(), b'void main\n'),
 ]
 prefix = b''.join(Path(f).read_bytes() + b'\n' for f in ['src/runtime/rt.zc', 'src/core/core.zc', 'src/runtime/run.zc'])
 for name, source, expected in cases: