feat: support increment and decrement statements (++/--) - #9
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- Lexer emits PlusPlus/MinusMinus tokens - Prefix and postfix forms are accepted in statement position and the for-loop post clause, desugared to compound assignment by 1 - Targets are restricted to plain variables with a dedicated InvalidIncrementTarget error, so forms like *p++ (whose C semantics would be *(p++)) are rejected rather than silently misinterpreted - Lexer/parser unit tests and e2e coverage; verified against clang Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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PR Description
Adds
++and--in both prefix and postfix form, valid in statement position and in thefor-loop post clause (for (int i = 0; i < n; i++)).PlusPlus/MinusMinustokens.parse_assignment_statemententry point (shared with the compound-assignment path from feat: support compound assignment operators (+=, -=, *=, /=, %=) #8) desugars all four forms tox += 1/x -= 1.InvalidIncrementTargeterror. This is deliberate:*p++in C means*(p++), and since rcc has no pointer arithmetic yet, quietly treating it as(*p)++would silently diverge from C — so it's a parse error instead.Tests: lexer distinguishes
++from+ +; parser tests for prefix/postfix desugaring and the*p++rejection; e2e tests includingi++in for-post. 32 unit + 32 e2e green, verified against clang.cc @hand-burger
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