M2compiler-V3/docs/summary_showcase14.md

Showcase 14 — session capabilities end-to-end

Tags v3-showcase14 (program) and v3-showcase14-summary (this doc). Suite 127/127; fixpoint OK (2,071,330 bytes).

What it runs

compiler/tests/showcase14.mod (Showcase14) links seven modules and exercises everything added this session:

IMPORT SysIO, TextIO, Utf8, Conversions, RealIO, ProgramArgs, IOChan;

1. Enumerations — TYPE Color = (red, green, blue), CONST Favourite = blue; a literal as a CASE label, ordinal ordering (red < green), and a CONST initialiser.
2. String content equality — "abc" = "abc", "abc" # "abd".
3. Unicode — Utf8.Decode("é", 0, cp, next) (strict RFC 3629) back to UCHAR, checked with UORD(cp) = 233.
4. Conversions — StrToInt("-56") and StrToReal("3.5") round-trips; IntToStr used to render the result.
5. ProgramArgs — ArgCount() (run with no arguments).
6. RealIO / TextIO — WriteReal(3.5) and UWriteString(U"ok ✓") (UTF-8).
7. IOChan — StdErrChan diagnostics via the channel handle.

Each check adds to an accumulator; the program prints and exits with it (42).

Output

showcase14 n=42
3.500000E+00 ok ✓

(stdout; the IOChan line goes to stderr so that stdio buffering does not reorder it against the unbuffered shim writes).

Registration

expect_run_files_out Showcase14 42 "showcase14 n=42" … with the Utf8/SysShim/sysio/textio/conversions/realio/programargs/ iochan definitions and bodies.

Session features exercised

Area	Where
Enums in expressions/CASE/CONST/params	docs/summary_lang-polish.md (v3-lang-polish)
String =/#	same
Unicode UCHAR/UString/Utf8/TextIO.U*	docs/summary_unicode.md (v3-unicode-1/-2)
Conversions / RealIO	docs/summary_stdlib-conversions.md
ProgramArgs / IOChan	docs/summary_programargs-iochan.md

Files

compiler/tests/showcase14.mod, compiler/run_tests.sh, docs/summary_showcase14.md.