Updating gogen from v1.19.7 to v1.20.2 causes test failures in TestFromTestdata

Problem

Updating github.com/goplus/gogen from v1.19.7 to v1.20.2 causes multiple TestFromTestdata tests to fail with compilation errors related to block comment formatting.

How to Reproduce

1. In go.mod, change gogen dependency:

- github.com/goplus/gogen v1.19.7
+ github.com/goplus/gogen v1.20.2

2. Run go mod tidy

3. Run tests:

go test ./cl/internal/convert/ -run TestFromTestdata -v

Error Messages

TestFromTestdata/gettext

expected declaration, found The

TestFromTestdata/gpgerror

expected declaration, found '*'

TestFromTestdata/issue507

Multiple block comment syntax errors

TestFromTestdata/keepcomment

comment not terminated

Root Cause

These errors occur because multi-line C block comments like:

/* Create an iterator for traversing a domain
   The domain NULL denotes the default domain */

Are split into multiple ast.Comment nodes (one per line) instead of a single node. With gogen v1.20.2, the Go printer now strictly follows the ast.Comment specification and produces invalid Go code from these incorrectly split comments.

Example of invalid generated output with gogen v1.20.2:

/* Create an iterator for traversing a domain
*/   The domain NULL denotes the default domain */
*/func ExampleFunction() {
}

Related

• #618 - Original issue tracking this bug

Start with go.mod and the conversion code under cl/internal/convert, then run go test ./cl/internal/convert/ -run TestFromTestdata -v after changing gogen to v1.20.2. Compare the failing gettext, gpgerror, issue507, and keepcomment cases with the related issue #618. Done means these TestFromTestdata cases compile and pass with the updated dependency.