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cmd/compile: only use dictionaries for conversions to type parameters

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Conversions to regular concrete types should not be rewritten during
stenciling.

Fixes #47740

Change-Id: I2b45e22f962dcd2e18bd6cc876ebc0f850860822
Reviewed-on: https://go-review.googlesource.com/c/go/+/342989
Trust: Keith Randall <khr@golang.org>
Trust: Dan Scales <danscales@google.com>
Trust: Cuong Manh Le <cuong.manhle.vn@gmail.com>
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Dan Scales <danscales@google.com>
This commit is contained in:
Keith Randall 2021-08-17 10:40:44 -07:00
parent eda3de0f79
commit 687f2acf6a
4 changed files with 65 additions and 0 deletions
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3
src/cmd/compile/internal/noder/stencil.go
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@ -1118,6 +1118,9 @@ func (subst *subster) node(n ir.Node) ir.Node {
m = convertUsingDictionary(subst.info, subst.info.dictParam, m.Pos(), m.(*ir.ConvExpr).X, x, m.Type(), x.X.Type())
}
case ir.ODOTTYPE, ir.ODOTTYPE2:
if !x.Type().HasTParam() {
break
}
dt := m.(*ir.TypeAssertExpr)
var rt ir.Node
if dt.Type().IsInterface() || dt.X.Type().IsEmptyInterface() {