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GALA-E0010 — Sibling files declare different package names

What it means. Two or more .gala files in the same directory declare different package names. Test files (_test.gala) may diverge, following Go’s pkg_test convention; regular sources may not.

Layout that triggers it

lib/a.gala   // package mylib
lib/b.gala   // package other    <- triggers the error

Compiler message

error[GALA-E0010]: directory lib has files with different package names: "other" and "mylib"
  --> lib/b.gala:1:1
  |
1 | package other
  | ^^^^^^^ use the same package name across all sibling .gala files, or…
  |
  = hint: use the same package name across all sibling .gala files, or move the file to a different directory

The header names the directory and both package names it found; the frame points at the file being compiled.

How to fix it

Either rename one package so both files agree:

// lib/b.gala
package mylib

…or move the outlier into its own directory, where it can keep its own package name.

Why the rule exists

GALA’s sibling-file resolution treats every .gala file in a directory as part of one compilation unit, so conflicting package names break cross-file type resolution. Catching the mismatch in the analyzer is much cheaper than letting it surface as a cascade of “unresolved identifier” errors during transform.