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go/types, types2: refactor Checker.rangeStmt for clarity

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Change-Id: I0c2f921389416ab222b84f77699fd4b3246ef0e0
Reviewed-on: https://go-review.googlesource.com/c/go/+/581776
Auto-Submit: Robert Griesemer <gri@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Robert Findley <rfindley@google.com>
This commit is contained in:
Robert Griesemer 2024-04-25 09:21:14 -07:00 committed by Gopher Robot
parent a4031ea1f5
commit fd99157f9d
2 changed files with 36 additions and 10 deletions
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23
src/cmd/compile/internal/types2/stmt.go
View File

@ -923,19 +923,26 @@ func (check *Checker) rangeStmt(inner stmtContext, s *syntax.ForStmt, rclause *s
check.errorf(lhs, InvalidSyntaxTree, "cannot declare %s", lhs)
obj = NewVar(lhs.Pos(), check.pkg, "_", nil) // dummy variable
}
assert(obj.typ == nil)
// initialize lhs iteration variable, if any
typ := rhs[i]
if typ == nil {
obj.typ = Typ[Invalid]
obj.used = true // don't complain about unused variable
continue
}
// initialize lhs variable
if constIntRange {
check.initVar(obj, &x, "range clause")
} else if typ := rhs[i]; typ != nil {
} else {
x.mode = value
x.expr = lhs // we don't have a better rhs expression to use here
x.typ = typ
check.initVar(obj, &x, "assignment") // error is on variable, use "assignment" not "range clause"
} else {
obj.typ = Typ[Invalid]
obj.used = true // don't complain about unused variable
}
assert(obj.typ != nil)
}
// declare variables
@ -954,9 +961,15 @@ func (check *Checker) rangeStmt(inner stmtContext, s *syntax.ForStmt, rclause *s
continue
}
// assign to lhs iteration variable, if any
typ := rhs[i]
if typ == nil {
continue
}
if constIntRange {
check.assignVar(lhs, nil, &x, "range clause")
} else if typ := rhs[i]; typ != nil {
} else {
x.mode = value
x.expr = lhs // we don't have a better rhs expression to use here
x.typ = typ

23
src/go/types/stmt.go
View File

@ -923,19 +923,26 @@ func (check *Checker) rangeStmt(inner stmtContext, s *ast.RangeStmt) {
check.errorf(lhs, InvalidSyntaxTree, "cannot declare %s", lhs)
obj = NewVar(lhs.Pos(), check.pkg, "_", nil) // dummy variable
}
assert(obj.typ == nil)
// initialize lhs iteration variable, if any
typ := rhs[i]
if typ == nil {
obj.typ = Typ[Invalid]
obj.used = true // don't complain about unused variable
continue
}
// initialize lhs variable
if constIntRange {
check.initVar(obj, &x, "range clause")
} else if typ := rhs[i]; typ != nil {
} else {
x.mode = value
x.expr = lhs // we don't have a better rhs expression to use here
x.typ = typ
check.initVar(obj, &x, "assignment") // error is on variable, use "assignment" not "range clause"
} else {
obj.typ = Typ[Invalid]
obj.used = true // don't complain about unused variable
}
assert(obj.typ != nil)
}
// declare variables
@ -954,9 +961,15 @@ func (check *Checker) rangeStmt(inner stmtContext, s *ast.RangeStmt) {
continue
}
// assign to lhs iteration variable, if any
typ := rhs[i]
if typ == nil {
continue
}
if constIntRange {
check.assignVar(lhs, nil, &x, "range clause")
} else if typ := rhs[i]; typ != nil {
} else {
x.mode = value
x.expr = lhs // we don't have a better rhs expression to use here
x.typ = typ