t27 basics 23: the stages of t27c, counted

What each stage of the t27c compiler produced for one small spec: bytes, tokens, tree, type check, HIR and backends. Lesson 23 of the t27 basics course.

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Where the numbers come from

The lesson spec public/t27/files/specs/basics/23_stages_of_t27c.t27, compiled clean on 7 backends by public/t27/t27_compiler.wasm, whose tests pass in the site test runner
Compiler verdicts, error lines, code and counts quoted on this page are what the same wasm answered in node 22 when the course was authored; words without a run behind them are said to be read, not run

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