From c3f994822d4950104c5382f2a4acd8b179af5034 Mon Sep 17 00:00:00 2001
From: Hojun-Cho <ghwns6743@gmail.com>
Date: Sat, 16 May 2026 00:03:19 +0900
Subject: [PATCH] lib/fmt+lib/log+lib/memio: drop rt_syscall stubs in tests;
 use os
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After 12436dd, lib/fmt and lib/log production code routed through
os.write / os.exit. The test files (fmttest, logtest, memiotest)
still carried the same @symbol("rt_syscall") syscall1ww / doexit
stub block with the (now stale) os↔io collision rationale. Same
mechanical drop as 12436dd: add use os;, route fail() through
os.exit, remove the stubs.

Also reword the stale workaround comment in lib/memio/memio.ww
covering rt_alloc/rt_free. The decls themselves stay until lib/os
exports alloc/free as a follow-up.

No combined.ww regen (these files aren't bootstrap-folded).
---
 lib/fmt/fmttest.ww     | 11 ++---------
 lib/log/logtest.ww     | 12 ++----------
 lib/memio/memio.ww     |  6 +++---
 lib/memio/memiotest.ww | 11 ++---------
 4 files changed, 9 insertions(+), 31 deletions(-)

diff --git a/lib/fmt/fmttest.ww b/lib/fmt/fmttest.ww
index 08ccfd88..0eea56b1 100644
--- a/lib/fmt/fmttest.ww
+++ b/lib/fmt/fmttest.ww
@@ -10,20 +10,13 @@
 use fmt;
 use io;
 use memio;
-
-// Direct exit(2) binding rather than `use os;` — os exports
-// read/write/close, which collide with io.read/write/close under
-// the driver's flat-scope concat.
-@symbol("rt_syscall") fn syscall1ww(num: i64, a: i64) i64;
-fn doexit(code: i32) void = {
-	syscall1ww(60i64, code: i64);
-};
+use os;
 
 // signalled — bumped before each scenario so a failing exit code
 // pinpoints the offending case.
 let signalled: i32 = 0;
 
-fn fail() void = { doexit(signalled + 10); };
+fn fail() void = { os.exit(signalled + 10); };
 
 fn streq(a: str, b: str) bool = {
 	if (a.len != b.len) { return false; };
diff --git a/lib/log/logtest.ww b/lib/log/logtest.ww
index 6bd9efa7..e5caeede 100644
--- a/lib/log/logtest.ww
+++ b/lib/log/logtest.ww
@@ -13,21 +13,13 @@ use fmt;
 use io;
 use log;
 use memio;
-
-// Direct exit(2) binding rather than `use os;` — os exports
-// read/write/close, which collide with io.read/write/close under
-// the driver's flat-scope concat. Same workaround as bufiotest /
-// fmttest / memiotest.
-@symbol("rt_syscall") fn syscall1ww(num: i64, a: i64) i64;
-fn doexit(code: i32) void = {
-	syscall1ww(60i64, code: i64);
-};
+use os;
 
 // signalled — bumped before each scenario so a failing exit code
 // pinpoints the offending case.
 let signalled: i32 = 0;
 
-fn fail() void = { doexit(signalled + 10); };
+fn fail() void = { os.exit(signalled + 10); };
 
 fn streq(a: str, b: str) bool = {
 	if (a.len != b.len) { return false; };
diff --git a/lib/memio/memio.ww b/lib/memio/memio.ww
index 2ed5fb3e..753f81aa 100644
--- a/lib/memio/memio.ww
+++ b/lib/memio/memio.ww
@@ -28,9 +28,9 @@
 
 use io;
 
-// Direct rt_alloc/rt_free bindings rather than `use os;` because os
-// exports read/write/close, which collide with io.read/write/close
-// under the driver's flat-scope concatenation. Same pattern as
+// Direct rt_alloc/rt_free bindings — the runtime heap primitives
+// memio.dynamic / dynamicfrom need to own the backing buffer. lib/os
+// holds the same FFI shape but doesn't export it; same pattern as
 // rt/ensure.ww.
 @symbol("rt_alloc") fn rtalloc(n: u64) *void;
 @symbol("rt_free")  fn rtfree(p: *void, n: u64) void;
diff --git a/lib/memio/memiotest.ww b/lib/memio/memiotest.ww
index 34dbcab1..228fe003 100644
--- a/lib/memio/memiotest.ww
+++ b/lib/memio/memiotest.ww
@@ -8,20 +8,13 @@
 use bytes;
 use io;
 use memio;
-
-// Direct exit(2) binding rather than `use os;` — os exports
-// read/write/close, which collide with io.read/write/close under
-// the driver's flat-scope concat (task #7).
-@symbol("rt_syscall") fn syscall1ww(num: i64, a: i64) i64;
-fn doexit(code: i32) void = {
-	syscall1ww(60i64, code: i64);
-};
+use os;
 
 // signalled — bumped by main before each test so a failing exit code
 // pinpoints the offending case.
 let signalled: i32 = 0;
 
-fn fail() void = { doexit(signalled + 10); };
+fn fail() void = { os.exit(signalled + 10); };
 
 fn putstr(s: str, into: []u8, off: i32) i32 = {
 	let i: i32 = 0;