selfhost: introduce using-based imports for compiler/parser/tools; keep includes temporarily. llvm: add PHI wiring JSON trace + unit/integration tests; fast test suite extended. runner: split selfhost helpers, small cleanups.

src/parser/expr/ternary.rs

@@ -4,6 +4,7 @@ use crate::parser::{NyashParser, ParseError};
 use crate::tokenizer::TokenType;
 
 #[inline]
+#[allow(dead_code)]
 fn is_sugar_enabled() -> bool {
     crate::parser::sugar_gate::is_enabled()
 }