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v2: simplify the type system; an initial version of the V interpreter

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This commit is contained in:
Alexander Medvednikov
2020-01-22 21:34:38 +01:00
parent 932392a7fd
commit 9f4661391d
33 changed files with 847 additions and 517 deletions
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5
vlib/compiler/expression.v
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@ -63,7 +63,7 @@ fn (p mut Parser) bool_expression() string {
p.gen('}')
//p.satisfies_interface(expected, typ, true)
}
// e.g. `return BinaryExpr{}` in a function expecting `Expr`
// e.g. `return InfixExpr{}` in a function expecting `Expr`
if expected != typ && expected in p.table.sum_types { // TODO perf
//p.warn('SUM CAST exp=$expected typ=$typ p.exp=$p.expected_type')
T := p.table.find_type(typ)
@ -87,7 +87,8 @@ fn (p mut Parser) bool_expression() string {
if typ in p.table.sum_types {
T := p.table.find_type(cast_typ)
if T.parent != typ {
p.error('cannot cast `$typ` to `$cast_typ`. `$cast_typ` is not a variant of `$typ`')
p.error('cannot cast `$typ` to `$cast_typ`. `$cast_typ` is not a variant of `$typ`' +
'parent=$T.parent')
}
p.cgen.set_placeholder(start_ph, '*($cast_typ*)')
p.gen('.obj')