feat: support compound assignment operators (+=, -=, *=, /=, %=) - #8
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- Lexer emits PlusEqual/MinusEqual/StarEqual/SlashEqual/PercentEqual - VarAssignStatement carries an optional compound BinaryOp; parsing is shared between statement position and for-loop post expressions - Codegen emits the lvalue once, then load-apply-store for compound ops, restricted to int targets - Unit tests for lexing/parsing plus e2e tests including compound assignment through a pointer and in for-post; verified against clang Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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PR Description
Adds C compound assignment operators:
+=,-=,*=,/=,%=.PlusEqual/MinusEqual/StarEqual/SlashEqual/PercentEqualtokens (one-character lookahead in the existing operator arms).VarAssignStatementnow carriesop: Option<BinaryOp>(Nonefor plain=). The= / op=tail parsing is factored into a sharedparse_assignmenthelper used by both statement position and thefor-loop post clause, sofor (...; ...; i += 1)works.*p += 2); compound assignment is type-checked to int targets.Tests: lexer + parser unit tests and 3 e2e tests (all five operators chained, compound assignment through a pointer, compound assignment in for-post). Suite is 29 unit + 30 e2e green, clippy/fmt clean, and the behavior is differentially verified against clang.
cc @hand-burger — this is the compound-assignment follow-up mentioned on #7;
++/--coming next on top of this.🤖 Generated with Claude Code