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Add PRI as a keyword and parse PRI ALT / PRI PAR constructs. Both are treated identically to their non-priority counterparts since Go's select and goroutines have no priority semantics. The AST records the Priority flag for potential future use. Note: This implementation accepts and correctly transpiles PRI ALT and PRI PAR, but does not provide true priority semantics. Go's select statement chooses uniformly at random among ready cases, and goroutines have no scheduling priority. Programs that depend on priority ordering for correctness will not behave as expected. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
dboreham
approved these changes
Feb 23, 2026
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Summary
PRIas a lexer keyword and parsesPRI ALT/PRI PARconstructsselectand goroutines +sync.WaitGroup)Priority boolfield for potential future useImportant caveat: This implementation does not provide true priority semantics. Go's
selectchooses uniformly at random among ready cases, and goroutines have no scheduling priority. Programs that depend on priority ordering for correctness will not behave the same as on a real occam/transputer runtime. See #84 for tracking true priority semantics.Closes #76
Test plan
TestPriAltBlock— parser correctly producesAltBlockwithPriority == trueTestPriParBlock— parser correctly producesParBlockwithPriority == trueTestE2E_PriAlt— transpile + compile + run PRI ALT program, verify outputTestE2E_PriPar— transpile + compile + run PRI PAR program, verify outputgo test ./lexer ./parser ./codegen)🤖 Generated with Claude Code