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The spec is not conclusive about whether a non-constant shift of certain untyped constant left operands is valid when the shift expression appears as an index in an index or slice expression, or as a size in a `make` function call. Despite identical spec rules in all these cases, cmd/compile accepts make([]byte, 1.0 << s) but pronounces an error for a[1.0 << s] (go/types accepts both). This change clarifies the spec by explicitly stating that an untyped constant left operand in a non-constant shift (1.0 in the above examples) will be given type `int` in these contexts. A separate issue #21693 addresses the cmd/compile bug. Fixes #14844. Change-Id: I4b52125e487a607fae377fcbed55463cdce9836c Reviewed-on: https://go-review.googlesource.com/60230 Reviewed-by: Russ Cox <rsc@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org> |
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