diff --git a/build.zig b/build.zig
index 2ff98819f1..d78a9de37b 100644
--- a/build.zig
+++ b/build.zig
@@ -209,8 +209,19 @@ pub fn installCHeaders(b: &Builder, c_header_files: []const u8) {
 
 fn nextValue(index: &usize, build_info: []const u8) -> []const u8 {
     const start = *index;
-    while (build_info[*index] != '\n' and build_info[*index] != '\r') : (*index += 1) { }
-    const result = build_info[start..*index];
-    *index += 1;
-    return result;
+    while (true) : (*index += 1) {
+        switch (build_info[*index]) {
+            '\n' => {
+                const result = build_info[start..*index];
+                *index += 1;
+                return result;
+            },
+            '\r' => {
+                const result = build_info[start..*index];
+                *index += 2;
+                return result;
+            },
+            else => continue,
+        }
+    }
 }
diff --git a/std/os/child_process.zig b/std/os/child_process.zig
index 6e86c99056..3a1cd02b56 100644
--- a/std/os/child_process.zig
+++ b/std/os/child_process.zig
@@ -15,6 +15,7 @@ const LinkedList = std.LinkedList;
 
 error PermissionDenied;
 error ProcessNotFound;
+error InvalidName;
 
 var children_nodes = LinkedList(&ChildProcess).init();
 
@@ -643,6 +644,7 @@ fn windowsCreateProcess(app_name: &u8, cmd_line: &u8, envp_ptr: ?&u8, cwd_ptr: ?
         return switch (err) {
             windows.ERROR.FILE_NOT_FOUND, windows.ERROR.PATH_NOT_FOUND => error.FileNotFound,
             windows.ERROR.INVALID_PARAMETER => unreachable,
+            windows.ERROR.INVALID_NAME => error.InvalidName,
             else => os.unexpectedErrorWindows(err),
         };
     }
diff --git a/std/os/index.zig b/std/os/index.zig
index e1b6a9dcce..f668546a37 100644
--- a/std/os/index.zig
+++ b/std/os/index.zig
@@ -1516,8 +1516,8 @@ const unexpected_error_tracing = false;
 /// and you get an unexpected error.
 pub fn unexpectedErrorPosix(errno: usize) -> error {
     if (unexpected_error_tracing) {
-        io.stderr.printf("unexpected errno: {}\n", errno) %% return error.Unexpected;
-        debug.printStackTrace() %% return error.Unexpected;
+        debug.warn("unexpected errno: {}\n", errno);
+        debug.dumpStackTrace();
     }
     return error.Unexpected;
 }
@@ -1526,8 +1526,8 @@ pub fn unexpectedErrorPosix(errno: usize) -> error {
 /// and you get an unexpected error.
 pub fn unexpectedErrorWindows(err: windows.DWORD) -> error {
     if (unexpected_error_tracing) {
-        io.stderr.printf("unexpected GetLastError(): {}\n", err) %% return error.Unexpected;
-        debug.printStackTrace() %% return error.Unexpected;
+        debug.warn("unexpected GetLastError(): {}\n", err);
+        debug.dumpStackTrace();
     }
     return error.Unexpected;
 }