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The last E4 item: a comptime call-frame dump. - New nullary `interp_print_frames` IR op (inst/print). The interpreter maintains a `call_chain` side-stack (push/pop a FuncId around each sx-bodied `call`, freed in deinit) and `printInterpFrames` appends the chain to its output — most-recent-last, with the dump frame itself skipped. emit_llvm makes the op a no-op: compiled code has no interpreter stack, and the only caller is `process.exit`'s dead `is_comptime()` branch. - Lowered from a name-recognized `__interp_print_frames()` builtin (tryLowerReflectionCall + inferExprType → void). - `trace.print_interpreter_frames()` wraps the builtin; wired into `process.exit`'s comptime branch (process.sx now imports trace.sx). - Frame source locations await IR-offset resolution (the comptime analog of DWARF), so only function names print today. examples/252-interp-frames.sx (top-level `#run` drives the dump; exit 0). Phase E4 (entry-point + stdlib error story) is now 100% complete.
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