Claude Code transcript

Here's a summary of all changes made:

Issue #73: Protocol declaration trailing colon terminator

Files: parser/parser.go - Added optional colon consumption after IS form (simple/sequential) protocol declarations - Added optional colon consumption after variant CASE protocol declarations, with DEDENT handling to properly unwind from the nested block back to the protocol's level

Issue #75: CASE with comma-separated match values and ELSE

Files: parser/parser.go - Added a loop after parsing the first CASE value expression to consume comma-separated additional values (for p.peekTokenIs(lexer.COMMA)) - ELSE was already supported — verified with tests

Issue #78: Parenthesized guard expressions in ALT

Files: ast/ast.go, parser/parser.go, codegen/codegen.go - Added LPAREN as an accepted first token in parseAltCase() for parenthesized guard expressions - Added IsSkip field to AltCase struct for guard & SKIP support - Updated guard parsing to handle SKIP after & (in addition to channel operations) - Updated codegen to generate default: for SKIP cases and skip nil-channel variable generation for them

Issue #79: Multi-line abbreviations (IS as line continuation)

Files: lexer/lexer.go - Added IS to isContinuationOp() so NEWLINE/INDENT/DEDENT are suppressed when IS appears at end of line

Tests added (8 new e2e tests):

• TestE2E_ProtocolTrailingColon — simple/sequential protocol with trailing :
• TestE2E_VariantProtocolTrailingColon — variant protocol with trailing :
• TestE2E_CaseCommaValues — CASE with comma-separated match values
• TestE2E_CaseCommaValuesElse — CASE with comma values and ELSE
• TestE2E_AltWithParenthesizedGuard — ALT with (expr) & channel ? var
• TestE2E_AltGuardedSkip — ALT with guard & SKIP
• TestE2E_MultiLineAbbreviation — VAL INT x IS\n 42 :
• TestE2E_MultiLineAbbreviationExpr — IS continuation with complex expression

All 8 new tests pass, full test suite passes with no regressions, and the course module still transpiles and passes go vet.