Claude Code transcript - page 1/2

User2026-02-23T03:45:43.058Z

Implement the following plan:

Fix: Channel array slices incompatible with direction-restricted params (#57)

Context

When a proc parameter is []CHAN BYTE in?, codegen emits in []<-chan byte. Callers passing []chan byte fail to compile because Go slices are not covariant — []chan byte cannot be assigned to []<-chan byte. This blocks transpilation of sort_pump.occ and other programs that pass channel arrays to direction-annotated params.

Approach: Drop direction from channel array params

Generate []chan T instead of []<-chan T / []chan<- T for channel array parameters. Single-channel params (CHAN OF INT c?) continue to use direction prefixes since Go individual channels ARE covariant.

Rationale: The codegen has no type-tracking system to know whether an argument is already directional, making call-site conversion loops impractical. Occam enforces direction safety at the source level, so the transpiler doesn't need to re-enforce it in Go. This is a one-line fix with no risk of regression.

Changes

1. `codegen/codegen.go` line 2039 — Drop direction for channel arrays

// Before:
goType = "[]" + chanDirPrefix(p.ChanDir) + g.occamTypeToGo(p.ChanElemType)
// After:
goType = "[]chan " + g.occamTypeToGo(p.ChanElemType)

2. `codegen/codegen_test.go` lines 617-629 — Update unit test assertions

Update TestChanArrayDirParamGen to expect []chan int for both ? and ! directions.

3. `codegen/e2e_array_test.go` — Add e2e test

Add TestE2E_ChanArrayDirParam that passes a [n]CHAN OF INT array to a proc with []CHAN OF INT in? and []CHAN OF INT out! params. Verifies the transpiled code compiles and runs correctly.

4. `CLAUDE.md` — Update mapping table

Add row documenting that direction is dropped for channel array params.

Verification

go test ./codegen -run TestChanArrayDirParamGen   # updated unit test
go test ./codegen -run TestE2E_ChanArrayDirParam  # new e2e test
go test ./...                                      # full suite
# Course module regression check:
./occam2go -I kroc/modules/course/libsrc -D TARGET.BITS.PER.WORD=32 -o /tmp/course_out.go kroc/modules/course/libsrc/course.module && go vet /tmp/course_out.go
# Repro from issue:
./occam2go -I kroc/modules/course/libsrc -D TARGET.BITS.PER.WORD=32 -o /tmp/sort_pump.go kroc/modules/course/examples/sort_pump.occ && go vet /tmp/sort_pump.go

If you need specific details from before exiting plan mode (like exact code snippets, error messages, or content you generated), read the full transcript at: /home/david/.claude/projects/-home-david-projects-code-associates-occam2go/2e133da4-2875-49f0-ade2-e7a0ac8c9763.jsonl

Assistant2026-02-23T03:45:45.896Z

Thinking

Let me implement the plan step by step. First, let me read the relevant files to understand the current code.

Assistant2026-02-23T03:45:46.339Z

I'll start by reading the relevant files in parallel.

Assistant2026-02-23T03:45:47.272Z

⚙ Read

{
  "file_path": "/home/david/projects/code-associates/occam2go/codegen/codegen.go",
  "offset": 2030,
  "limit": 20
}

Tool reply2026-02-23T03:45:47.293Z

  2030→	g.boolVars = oldBoolVars
  2031→	g.retypesRenames = oldRenames
  2032→}
  2033→
  2034→func (g *Generator) generateProcParams(params []ast.ProcParam) string {
  2035→	var parts []string
  2036→	for _, p := range params {
  2037→		var goType string
  2038→		if p.IsChanArray {
  2039→			goType = "[]" + chanDirPrefix(p.ChanDir) + g.occamTypeToGo(p.ChanElemType)
  2040→		} else if p.IsChan {
  2041→			goType = chanDirPrefix(p.ChanDir) + g.occamTypeToGo(p.ChanElemType)
  2042→		} else if p.IsOpenArray {
  2043→			goType = "[]" + g.occamTypeToGo(p.Type)
  2044→		} else if p.ArraySize != "" {
  2045→			// Fixed-size array parameter: use slice for Go compatibility
  2046→			// (occam [n]TYPE and []TYPE both map to Go slices)
  2047→			goType = "[]" + g.occamTypeToGo(p.Type)
  2048→		} else {
  2049→			goType = g.occamTypeToGo(p.Type)

Assistant2026-02-23T03:45:47.978Z

⚙ Read

{
  "file_path": "/home/david/projects/code-associates/occam2go/codegen/codegen_test.go",
  "offset": 610,
  "limit": 30
}

Tool reply2026-02-23T03:45:47.991Z

   610→	output := transpile(t, input)
   611→
   612→	if !strings.Contains(output, "func worker(input <-chan int, output chan<- int)") {
   613→		t.Errorf("expected directed channel types in output, got:\n%s", output)
   614→	}
   615→}
   616→
   617→func TestChanArrayDirParamGen(t *testing.T) {
   618→	input := `PROC worker([]CHAN OF INT cs?, []CHAN OF INT out!)
   619→  SKIP
   620→`
   621→	output := transpile(t, input)
   622→
   623→	if !strings.Contains(output, "cs []<-chan int") {
   624→		t.Errorf("expected '[]<-chan int' for input chan array, got:\n%s", output)
   625→	}
   626→	if !strings.Contains(output, "out []chan<- int") {
   627→		t.Errorf("expected '[]chan<- int' for output chan array, got:\n%s", output)
   628→	}
   629→}
   630→
   631→func TestRecordFieldAccessCodegen(t *testing.T) {
   632→	input := `RECORD POINT
   633→  INT x:
   634→  INT y:
   635→SEQ
   636→  POINT p:
   637→  INT v:
   638→  v := p[x]
   639→`

Assistant2026-02-23T03:45:48.754Z

⚙ Read

{
  "file_path": "/home/david/projects/code-associates/occam2go/codegen/e2e_array_test.go",
  "offset": 1,
  "limit": 30
}

Tool reply2026-02-23T03:45:48.760Z

     1→package codegen
     2→
     3→import "testing"
     4→
     5→func TestE2E_ArrayBasic(t *testing.T) {
     6→	// Test basic array: declare, store, load
     7→	occam := `SEQ
     8→  [5]INT arr:
     9→  arr[0] := 42
    10→  print.int(arr[0])
    11→`
    12→	output := transpileCompileRun(t, occam)
    13→	expected := "42\n"
    14→	if output != expected {
    15→		t.Errorf("expected %q, got %q", expected, output)
    16→	}
    17→}
    18→
    19→func TestE2E_ArrayWithLoop(t *testing.T) {
    20→	// Test filling array with replicated SEQ and printing all elements
    21→	occam := `SEQ
    22→  [5]INT arr:
    23→  SEQ i = 0 FOR 5
    24→    arr[i] := i * 10
    25→  SEQ i = 0 FOR 5
    26→    print.int(arr[i])
    27→`
    28→	output := transpileCompileRun(t, occam)
    29→	expected := "0\n10\n20\n30\n40\n"
    30→	if output != expected {

Assistant2026-02-23T03:45:53.096Z

Now let me check the end of e2e_array_test.go and the CLAUDE.md mapping table section.

Assistant2026-02-23T03:45:54.323Z

$ Bash

Get line count of e2e array test file

wc -l /home/david/projects/code-associates/occam2go/codegen/e2e_array_test.go

Tool reply2026-02-23T03:45:54.360Z

308 /home/david/projects/code-associates/occam2go/codegen/e2e_array_test.go

Assistant2026-02-23T03:45:56.062Z

⚙ Grep

{
  "pattern": "PROC f\\(\\[\\]CHAN",
  "path": "/home/david/projects/code-associates/occam2go/CLAUDE.md",
  "output_mode": "content",
  "-C": 2
}

Tool reply2026-02-23T03:45:56.187Z

114-| `cs[i] ! 42` | `cs[i] <- 42` |
115-| `cs[i] ? x` | `x = <-cs[i]` |
116:| `PROC f([]CHAN OF INT cs)` | `func f(cs []chan int)` |
117-| `PROC f(CHAN OF INT c?)` | `func f(c <-chan int)` (input/receive-only) |
118-| `PROC f(CHAN OF INT c!)` | `func f(c chan<- int)` (output/send-only) |

Assistant2026-02-23T03:45:58.945Z

⚙ Read

{
  "file_path": "/home/david/projects/code-associates/occam2go/codegen/e2e_array_test.go",
  "offset": 298,
  "limit": 15
}

Tool reply2026-02-23T03:45:58.951Z

   298→  a, b, c := 10, 20, 30
   299→  print.int(a)
   300→  print.int(b)
   301→  print.int(c)
   302→`
   303→	output := transpileCompileRun(t, occam)
   304→	expected := "10\n20\n30\n"
   305→	if output != expected {
   306→		t.Errorf("expected %q, got %q", expected, output)
   307→	}
   308→}
   309→

Assistant2026-02-23T03:46:01.413Z

Good. Now I have all the context I need. Let me make all the changes.

Assistant2026-02-23T03:46:03.041Z

⚙ TaskCreate

Drop direction prefix from channel array params, update tests, add e2e test, update CLAUDE.md

{
  "subject": "Fix channel array direction param codegen",
  "activeForm": "Fixing channel array direction params"
}

Tool reply2026-02-23T03:46:03.058Z

Task #1 created successfully: Fix channel array direction param codegen

Assistant2026-02-23T03:46:06.373Z

⚙ TaskUpdate

{
  "taskId": "1",
  "status": "in_progress"
}

Tool reply2026-02-23T03:46:06.375Z

Updated task #1 status

Assistant2026-02-23T03:46:08.468Z

Now let me make all four changes in parallel:

Assistant2026-02-23T03:46:10.535Z

✏️ Edit codegen.go

/home/david/projects/code-associates/occam2go/codegen/codegen.go

−

		goType = "[]" + chanDirPrefix(p.ChanDir) + g.occamTypeToGo(p.ChanElemType)

		goType = "[]chan " + g.occamTypeToGo(p.ChanElemType)

Tool reply2026-02-23T03:46:10.547Z

The file /home/david/projects/code-associates/occam2go/codegen/codegen.go has been updated successfully.

Assistant2026-02-23T03:46:13.266Z

✏️ Edit codegen_test.go

/home/david/projects/code-associates/occam2go/codegen/codegen_test.go

−

	if !strings.Contains(output, "cs []<-chan int") {
		t.Errorf("expected '[]<-chan int' for input chan array, got:\n%s", output)
	}
	if !strings.Contains(output, "out []chan<- int") {
		t.Errorf("expected '[]chan<- int' for output chan array, got:\n%s", output)
	}

	if !strings.Contains(output, "cs []chan int") {
		t.Errorf("expected '[]chan int' for input chan array, got:\n%s", output)
	}
	if !strings.Contains(output, "out []chan int") {
		t.Errorf("expected '[]chan int' for output chan array, got:\n%s", output)
	}

Tool reply2026-02-23T03:46:13.274Z

The file /home/david/projects/code-associates/occam2go/codegen/codegen_test.go has been updated successfully.

Assistant2026-02-23T03:46:16.426Z

✏️ Edit CLAUDE.md

/home/david/projects/code-associates/occam2go/CLAUDE.md

−

| `PROC f([]CHAN OF INT cs)` | `func f(cs []chan int)` |
| `PROC f(CHAN OF INT c?)` | `func f(c <-chan int)` (input/receive-only) |
| `PROC f(CHAN OF INT c!)` | `func f(c chan<- int)` (output/send-only) |

| `PROC f([]CHAN OF INT cs)` | `func f(cs []chan int)` |
| `PROC f([]CHAN OF INT cs?)` | `func f(cs []chan int)` (direction dropped for array params) |
| `PROC f([]CHAN OF INT cs!)` | `func f(cs []chan int)` (direction dropped for array params) |
| `PROC f(CHAN OF INT c?)` | `func f(c <-chan int)` (input/receive-only) |
| `PROC f(CHAN OF INT c!)` | `func f(c chan<- int)` (output/send-only) |

Tool reply2026-02-23T03:46:16.427Z

<tool_use_error>File has not been read yet. Read it first before writing to it.</tool_use_error>

Assistant2026-02-23T03:46:19.075Z

⚙ Read

{
  "file_path": "/home/david/projects/code-associates/occam2go/CLAUDE.md",
  "offset": 112,
  "limit": 12
}

Tool reply2026-02-23T03:46:19.092Z

   112→| `<<` / `>>` | `<<` / `>>` (shifts) |
   113→| `[5]CHAN OF INT cs:` | `cs := make([]chan int, 5)` + init loop |
   114→| `cs[i] ! 42` | `cs[i] <- 42` |
   115→| `cs[i] ? x` | `x = <-cs[i]` |
   116→| `PROC f([]CHAN OF INT cs)` | `func f(cs []chan int)` |
   117→| `PROC f(CHAN OF INT c?)` | `func f(c <-chan int)` (input/receive-only) |
   118→| `PROC f(CHAN OF INT c!)` | `func f(c chan<- int)` (output/send-only) |
   119→| `f(out!, in?)` (call-site dir) | `f(out, in)` (direction annotations ignored) |
   120→| Non-VAL params | `*type` pointer params, callers pass `&arg` |
   121→| `PROC f([]INT arr)` | `func f(arr []int)` (open array param, slice) |
   122→| `PROC f(VAL []INT arr)` | `func f(arr []int)` (VAL open array, also slice) |
   123→| `PROC f([2]INT arr)` | `func f(arr *[2]int)` (fixed-size array param) |

Assistant2026-02-23T03:46:24.445Z

✏️ Edit CLAUDE.md

/home/david/projects/code-associates/occam2go/CLAUDE.md

−

| `PROC f([]CHAN OF INT cs)` | `func f(cs []chan int)` |
| `PROC f(CHAN OF INT c?)` | `func f(c <-chan int)` (input/receive-only) |
| `PROC f(CHAN OF INT c!)` | `func f(c chan<- int)` (output/send-only) |

| `PROC f([]CHAN OF INT cs)` | `func f(cs []chan int)` |
| `PROC f([]CHAN OF INT cs?)` | `func f(cs []chan int)` (direction dropped for array params) |
| `PROC f([]CHAN OF INT cs!)` | `func f(cs []chan int)` (direction dropped for array params) |
| `PROC f(CHAN OF INT c?)` | `func f(c <-chan int)` (input/receive-only) |
| `PROC f(CHAN OF INT c!)` | `func f(c chan<- int)` (output/send-only) |

Tool reply2026-02-23T03:46:24.453Z

The file /home/david/projects/code-associates/occam2go/CLAUDE.md has been updated successfully.

Assistant2026-02-23T03:46:27.393Z

Now add the e2e test at the end of e2e_array_test.go:

Assistant2026-02-23T03:46:35.083Z

✏️ Edit e2e_array_test.go

/home/david/projects/code-associates/occam2go/codegen/e2e_array_test.go

−

  a, b, c := 10, 20, 30
  print.int(a)
  print.int(b)
  print.int(c)
`
	output := transpileCompileRun(t, occam)
	expected := "10\n20\n30\n"
	if output != expected {
		t.Errorf("expected %q, got %q", expected, output)
	}
}

  a, b, c := 10, 20, 30
  print.int(a)
  print.int(b)
  print.int(c)
`
	output := transpileCompileRun(t, occam)
	expected := "10\n20\n30\n"
	if output != expected {
		t.Errorf("expected %q, got %q", expected, output)
	}
}

func TestE2E_ChanArrayDirParam(t *testing.T) {
	// Channel arrays passed to direction-annotated params must compile
	// (Go slices are not covariant, so direction is dropped for array params)
	occam := `PROC sender([]CHAN OF INT out!)
  SEQ i = 0 FOR SIZE out
    out[i] ! i
:
PROC receiver([]CHAN OF INT in?)
  SEQ i = 0 FOR SIZE in
    INT v:
    SEQ
      in[i] ? v
      print.int(v)
:
SEQ
  [3]CHAN OF INT cs:
  PAR
    sender(cs)
    receiver(cs)
`
	output := transpileCompileRun(t, occam)
	expected := "0\n1\n2\n"
	if output != expected {
		t.Errorf("expected %q, got %q", expected, output)
	}
}

Tool reply2026-02-23T03:46:35.094Z

The file /home/david/projects/code-associates/occam2go/codegen/e2e_array_test.go has been updated successfully.

Assistant2026-02-23T03:46:37.200Z

Now let me run the tests:

Assistant2026-02-23T03:46:39.166Z

$ Bash

Run the updated unit test and new e2e test

go test ./codegen -run "TestChanArrayDirParamGen|TestE2E_ChanArrayDirParam" -v 2>&1

Tool reply2026-02-23T03:46:39.567Z

=== RUN   TestChanArrayDirParamGen
--- PASS: TestChanArrayDirParamGen (0.00s)
=== RUN   TestE2E_ChanArrayDirParam
--- PASS: TestE2E_ChanArrayDirParam (0.08s)
PASS
ok  	github.com/codeassociates/occam2go/codegen	0.084s

Assistant2026-02-23T03:46:42.958Z

Both pass. Now let me run the full test suite and the course module regression check in parallel:

Assistant2026-02-23T03:46:43.788Z

$ Bash

Run full test suite

go test ./... 2>&1

Assistant2026-02-23T03:46:46.159Z

$ Bash

Course module regression check

go build -o /tmp/occam2go . && /tmp/occam2go -I kroc/modules/course/libsrc -D TARGET.BITS.PER.WORD=32 -o /tmp/course_out.go kroc/modules/course/libsrc/course.module && go vet /tmp/course_out.go 2>&1

Tool reply2026-02-23T03:47:02.938Z

?   	github.com/codeassociates/occam2go	[no test files]
?   	github.com/codeassociates/occam2go/ast	[no test files]
ok  	github.com/codeassociates/occam2go/codegen	18.008s
ok  	github.com/codeassociates/occam2go/lexer	(cached)
ok  	github.com/codeassociates/occam2go/modgen	(cached)
ok  	github.com/codeassociates/occam2go/parser	(cached)
ok  	github.com/codeassociates/occam2go/preproc	(cached)

Tool reply2026-02-23T03:47:11.817Z

Assistant2026-02-23T03:47:14.811Z

All tests pass and the course module regression check succeeds. Let me also verify the sort_pump.occ repro from the issue:

Assistant2026-02-23T03:47:16.040Z

$ Bash

Verify sort_pump.occ from the issue

/tmp/occam2go -I kroc/modules/course/libsrc -D TARGET.BITS.PER.WORD=32 -o /tmp/sort_pump.go kroc/modules/course/examples/sort_pump.occ && go vet /tmp/sort_pump.go 2>&1

Tool reply2026-02-23T03:47:40.312Z

Assistant2026-02-23T03:47:42.727Z

⚙ TaskUpdate

{
  "taskId": "1",
  "status": "completed"
}

Tool reply2026-02-23T03:47:42.730Z

Updated task #1 status

Assistant2026-02-23T03:47:51.293Z

All done. Here's a summary of the changes:

codegen/codegen.go:2039 — Changed channel array param generation from "[]" + chanDirPrefix(p.ChanDir) + ... to "[]chan " + ..., dropping direction prefixes for array params (Go slices aren't covariant).
codegen/codegen_test.go:623-628 — Updated TestChanArrayDirParamGen assertions to expect []chan int instead of []<-chan int / []chan<- int.
codegen/e2e_array_test.go — Added TestE2E_ChanArrayDirParam that passes a [3]CHAN OF INT array to procs with ? and ! direction annotations, verifying it compiles and runs correctly.
CLAUDE.md — Added two rows documenting that direction is dropped for []CHAN OF INT cs? and []CHAN OF INT cs! array params.

All tests pass, course module regression passes, and sort_pump.occ now transpiles and vets cleanly.

User2026-02-23T03:48:02.044Z

Thank you. Please create a PR for this fix.

Assistant2026-02-23T03:48:06.555Z

$ Bash

Show working tree status

git status

Tool reply2026-02-23T03:48:06.597Z

On branch main
Your branch is up to date with 'origin/main'.

Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git restore <file>..." to discard changes in working directory)
	modified:   CLAUDE.md
	modified:   codegen/codegen.go
	modified:   codegen/codegen_test.go
	modified:   codegen/e2e_array_test.go

no changes added to commit (use "git add" and/or "git commit -a")

Assistant2026-02-23T03:48:07.126Z

$ Bash

Show all changes

git diff

Tool reply2026-02-23T03:48:07.157Z

diff --git a/CLAUDE.md b/CLAUDE.md
index 4082424..8ab5188 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -114,6 +114,8 @@ Six packages, one pipeline:
 | `cs[i] ! 42` | `cs[i] <- 42` |
 | `cs[i] ? x` | `x = <-cs[i]` |
 | `PROC f([]CHAN OF INT cs)` | `func f(cs []chan int)` |
+| `PROC f([]CHAN OF INT cs?)` | `func f(cs []chan int)` (direction dropped for array params) |
+| `PROC f([]CHAN OF INT cs!)` | `func f(cs []chan int)` (direction dropped for array params) |
 | `PROC f(CHAN OF INT c?)` | `func f(c <-chan int)` (input/receive-only) |
 | `PROC f(CHAN OF INT c!)` | `func f(c chan<- int)` (output/send-only) |
 | `f(out!, in?)` (call-site dir) | `f(out, in)` (direction annotations ignored) |
diff --git a/codegen/codegen.go b/codegen/codegen.go
index 0d2a53b..21b3655 100644
--- a/codegen/codegen.go
+++ b/codegen/codegen.go
@@ -2036,7 +2036,7 @@ func (g *Generator) generateProcParams(params []ast.ProcParam) string {
 	for _, p := range params {
 		var goType string
 		if p.IsChanArray {
-			goType = "[]" + chanDirPrefix(p.ChanDir) + g.occamTypeToGo(p.ChanElemType)
+			goType = "[]chan " + g.occamTypeToGo(p.ChanElemType)
 		} else if p.IsChan {
 			goType = chanDirPrefix(p.ChanDir) + g.occamTypeToGo(p.ChanElemType)
 		} else if p.IsOpenArray {
diff --git a/codegen/codegen_test.go b/codegen/codegen_test.go
index 44d85a1..c6cda3d 100644
--- a/codegen/codegen_test.go
+++ b/codegen/codegen_test.go
@@ -620,11 +620,11 @@ func TestChanArrayDirParamGen(t *testing.T) {
 `
 	output := transpile(t, input)
 
-	if !strings.Contains(output, "cs []<-chan int") {
-		t.Errorf("expected '[]<-chan int' for input chan array, got:\n%s", output)
+	if !strings.Contains(output, "cs []chan int") {
+		t.Errorf("expected '[]chan int' for input chan array, got:\n%s", output)
 	}
-	if !strings.Contains(output, "out []chan<- int") {
-		t.Errorf("expected '[]chan<- int' for output chan array, got:\n%s", output)
+	if !strings.Contains(output, "out []chan int") {
+		t.Errorf("expected '[]chan int' for output chan array, got:\n%s", output)
 	}
 }
 
diff --git a/codegen/e2e_array_test.go b/codegen/e2e_array_test.go
index b4deac8..65dc3b4 100644
--- a/codegen/e2e_array_test.go
+++ b/codegen/e2e_array_test.go
@@ -306,3 +306,30 @@ func TestE2E_MultiAssignmentValues(t *testing.T) {
 		t.Errorf("expected %q, got %q", expected, output)
 	}
 }
+
+func TestE2E_ChanArrayDirParam(t *testing.T) {
+	// Channel arrays passed to direction-annotated params must compile
+	// (Go slices are not covariant, so direction is dropped for array params)
+	occam := `PROC sender([]CHAN OF INT out!)
+  SEQ i = 0 FOR SIZE out
+    out[i] ! i
+:
+PROC receiver([]CHAN OF INT in?)
+  SEQ i = 0 FOR SIZE in
+    INT v:
+    SEQ
+      in[i] ? v
+      print.int(v)
+:
+SEQ
+  [3]CHAN OF INT cs:
+  PAR
+    sender(cs)
+    receiver(cs)
+`
+	output := transpileCompileRun(t, occam)
+	expected := "0\n1\n2\n"
+	if output != expected {
+		t.Errorf("expected %q, got %q", expected, output)
+	}
+}

Assistant2026-02-23T03:48:07.674Z

$ Bash

Show recent commits

git log --oneline -5

Tool reply2026-02-23T03:48:07.720Z

5a513cd Merge pull request #58 from codeassociates/fix/scope-boolvars-per-proc
347f176 Scope boolVars per proc/function body to prevent cross-proc leakage
36a462d Merge pull request #55 from codeassociates/fix/typed-abbreviation-type-loss
74b192a Fix typed abbreviations losing declared type in local scope
c1adc5f Merge pull request #54 from codeassociates/feat/round-trunc-qualifiers

Assistant2026-02-23T03:48:10.429Z

$ Bash

Create feature branch

git checkout -b fix/chan-array-dir-params

Tool reply2026-02-23T03:48:51.508Z

Switched to a new branch 'fix/chan-array-dir-params'

Assistant2026-02-23T03:48:56.757Z

$ Bash

Stage and commit all changes

git add CLAUDE.md codegen/codegen.go codegen/codegen_test.go codegen/e2e_array_test.go && git commit -m "$(cat <<'EOF'
Drop direction from channel array params to fix Go slice covariance issue

Go slices are not covariant, so []chan byte cannot be assigned to
[]<-chan byte. Generate []chan T for channel array params instead,
while keeping direction prefixes for single-channel params.

Fixes #57

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
EOF
)"

Tool reply2026-02-23T03:50:08.552Z

235652f Drop direction from channel array params to fix Go slice covariance issue

4 files changed, 34 insertions(+), 5 deletions(-)

Assistant2026-02-23T03:50:11.516Z

$ Bash

Push branch to remote

git push -u origin fix/chan-array-dir-params 2>&1

Tool reply2026-02-23T03:50:20.572Z

remote: 
remote: Create a pull request for 'fix/chan-array-dir-params' on GitHub by visiting:        
remote:      https://github.com/codeassociates/occam2go/pull/new/fix/chan-array-dir-params        
remote: 
To associate-1.github.com:codeassociates/occam2go.git
 * [new branch]      fix/chan-array-dir-params -> fix/chan-array-dir-params
branch 'fix/chan-array-dir-params' set up to track 'origin/fix/chan-array-dir-params'.

Assistant2026-02-23T03:50:29.158Z

$ Bash

Create pull request

gh pr create --title "Fix channel array slices incompatible with direction-restricted params" --body "$(cat <<'EOF'
## Summary
- Drop direction prefixes (`<-chan`, `chan<-`) from channel array params, generating `[]chan T` instead of `[]<-chan T` / `[]chan<- T`
- Go slices are not covariant, so `[]chan byte` cannot be assigned to `[]<-chan byte`, causing compilation failures when passing channel arrays to direction-annotated proc params
- Single-channel params (`CHAN OF INT c?`) continue to use direction prefixes since individual channels are covariant in Go

## Test plan
- [x] Updated `TestChanArrayDirParamGen` unit test to expect `[]chan int`
- [x] Added `TestE2E_ChanArrayDirParam` e2e test (sender/receiver with direction-annotated `[]CHAN OF INT` params)
- [x] Full test suite passes (`go test ./...`)
- [x] Course module regression check passes
- [x] `sort_pump.occ` transpiles and passes `go vet`

Fixes #57

🤖 Generated with [Claude Code](https://claude.com/claude-code)
EOF
)"

Tool reply2026-02-23T03:50:32.379Z

https://github.com/codeassociates/occam2go/pull/59

Assistant2026-02-23T03:50:34.402Z

PR created: https://github.com/codeassociates/occam2go/pull/59

User2026-02-23T03:51:42.741Z

Thank you. If the PR has been approved and CI checks have passed, please merge it.

Assistant2026-02-23T03:51:46.353Z

$ Bash

Check PR approval and CI status

gh pr view 59 --json state,reviewDecision,statusCheckRollup --jq '{state: .state, reviewDecision: .reviewDecision, checks: [.statusCheckRollup[] | {name: .name, status: .status, conclusion: .conclusion}]}'

Tool reply2026-02-23T03:52:04.456Z

{"checks":[{"conclusion":"SUCCESS","name":"test","status":"COMPLETED"}],"reviewDecision":"APPROVED","state":"OPEN"}

Assistant2026-02-23T03:52:06.588Z

PR is approved and CI has passed. Merging now.

Assistant2026-02-23T03:52:07.220Z

$ Bash

Merge the approved PR

gh pr merge 59 --merge

Tool reply2026-02-23T03:52:13.337Z

Assistant2026-02-23T03:52:15.019Z

PR #59 has been merged.

User2026-02-23T03:52:20.750Z

Caveat: The messages below were generated by the user while running local commands. DO NOT respond to these messages or otherwise consider them in your response unless the user explicitly asks you to.

User2026-02-23T03:52:20.749Z

/exit exit

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Claude Code transcript - page 1/2

Fix: Channel array slices incompatible with direction-restricted params (#57)

Context

Approach: Drop direction from channel array params

Changes

1. codegen/codegen.go line 2039 — Drop direction for channel arrays

2. codegen/codegen_test.go lines 617-629 — Update unit test assertions

3. codegen/e2e_array_test.go — Add e2e test

4. CLAUDE.md — Update mapping table

Verification

1. `codegen/codegen.go` line 2039 — Drop direction for channel arrays

2. `codegen/codegen_test.go` lines 617-629 — Update unit test assertions

3. `codegen/e2e_array_test.go` — Add e2e test

4. `CLAUDE.md` — Update mapping table