CRYSTAL-EVAL(1) Crystal Compiler Command Line Reference Guide CRYSTAL-EVAL(1) (NAME) crystal-eval - Crystal (SYNOPSIS) crystal eval [] [_] (DESCRIPTION) . . (OPTIONS) -d, --debug . gdb lldb valgrind . --no-debug . -D FLAG, --define FLAG . . (target triple) --target-triple . --error-trace (stack trace). -O LEVEL : 0 () 1 2 3. OPTIMIZATIONS . --release (release). -O3 --single-module. -s, --stats . . -p, --progress . -t, --time . --no-color . crystal 1.21.0 2026-07-23 CRYSTAL-EVAL(1)