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checker: disallow accessing fields or methods of void (#10552)

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shadowninja55 2021-06-24 00:33:12 -04:00 committed by GitHub
parent c0b53048f5
commit 83eb9d5d07
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1 changed files with 6 additions and 4 deletions
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10
vlib/v/checker/checker.v
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@ -1778,6 +1778,10 @@ pub fn (mut c Checker) method_call(mut call_expr ast.CallExpr) ast.Type {
if left_type_sym.kind in [.sum_type, .interface_] && method_name == 'type_name' {
return ast.string_type
}
if left_type == ast.void_type {
c.error('`void` type has no methods', call_expr.left.position())
return ast.void_type
}
mut has_generic := false // x.foo<T>() instead of x.foo<int>()
mut concrete_types := []ast.Type{}
for concrete_type in call_expr.concrete_types {
@ -2907,6 +2911,7 @@ pub fn (mut c Checker) selector_expr(mut node ast.SelectorExpr) ast.Type {
node.name_type = name_type
return ast.string_type
}
//
old_selector_expr := c.inside_selector_expr
c.inside_selector_expr = true
@ -2915,10 +2920,7 @@ pub fn (mut c Checker) selector_expr(mut node ast.SelectorExpr) ast.Type {
//
c.using_new_err_struct = using_new_err_struct_save
if typ == ast.void_type_idx {
// This means that the variable's value was assigned to an
// unknown function or method, so the error was already handled
// earlier
// c.error('unknown selector expression', node.pos)
c.error('`void` type has no fields', node.pos)
return ast.void_type
}
node.expr_type = typ