Support index expressions and selectors in range loops #1053

New issue

Open

opened 2025-12-28 17:15:04 +00:00 by sami · 0 comments

sami commented

2025-12-28 17:15:04 +00:00

Owner

Originally created by @roman-khimov on GitHub (Jan 11, 2023).

This won't work with the compiler we have:

ints := []int{5, 4, 3, 2, 1}
for ints[0] = range ints {
        break
}
return ints[0]

Right now that'd be

panic: interface conversion: ast.Expr is *ast.IndexExpr, not *ast.Ident [recovered]
        panic: interface conversion: ast.Expr is *ast.IndexExpr, not *ast.Ident

It'll be a bit more gentle error soon, but properly fixing this requires some refactoring of *ast.AssignStmt handler and that's not what I'd like to do right now for this very specific case.

Originally created by @roman-khimov on GitHub (Jan 11, 2023). This won't work with the compiler we have: ``` ints := []int{5, 4, 3, 2, 1} for ints[0] = range ints { break } return ints[0] ``` Right now that'd be ``` panic: interface conversion: ast.Expr is *ast.IndexExpr, not *ast.Ident [recovered] panic: interface conversion: ast.Expr is *ast.IndexExpr, not *ast.Ident ``` It'll be a bit more gentle error soon, but properly fixing this requires some refactoring of `*ast.AssignStmt` handler and that's not what I'd like to do right now for this very specific case.