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go/tools/ssa/interp: make iface.eq robust against nil types

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A future version of go/types.IsIdentical does not accept
nil types anymore.

R=adonovan
CC=golang-dev
https://golang.org/cl/16150043
This commit is contained in:
Robert Griesemer 2013-10-23 13:26:23 -07:00
parent 36c288d6d7
commit a1886cc6ef
1 changed files with 9 additions and 1 deletions
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10
ssa/interp/value.go
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@ -169,9 +169,17 @@ func (x structure) hash(t types.Type) int {
return h return h
} }
// nil-tolerant variant of types.IsIdentical.
func sameType(x, y types.Type) bool {
if x == nil {
return y == nil
}
return y != nil && types.IsIdentical(x, y)
}
func (x iface) eq(t types.Type, _y interface{}) bool { func (x iface) eq(t types.Type, _y interface{}) bool {
y := _y.(iface) y := _y.(iface)
return types.IsIdentical(x.t, y.t) && (x.t == nil || equals(x.t, x.v, y.v)) return sameType(x.t, y.t) && (x.t == nil || equals(x.t, x.v, y.v))
} }
func (x iface) hash(_ types.Type) int { func (x iface) hash(_ types.Type) int {