Go code generation fails for PostgreSQL ENUM values with '+' and '-' due to duplicate constant names

[arjun-liveeye]

Version

1.31.1

Version

• sqlc: v1.31.1
• PostgreSQL: 18x
• Go: go1.26.1 windows/amd64

What happened?

When using a PostgreSQL ENUM that contains values with + and - (e.g. blood groups), sqlc generates duplicate Go constant names, causing the generated code to fail to compile.

For example:

CREATE TYPE blood_group_type AS ENUM (
    'A+',
    'A-',
    'B+',
    'B-',
    'AB+',
    'AB-',
    'O+',
    'O-'
);

[alliasgher]

Opened #4519 for this.

[arjun-liveeye]

Kindly update this issue after the PR is merged so I can verify it in the appropriate release.