compiler: Don't allow builtin function values.
According to the spec, http://golang.org/ref/spec#Built-in_functions: "built-in functions do not have standard Go types, so they can only appear in call expressions; they cannot be used as function values." Fixes golang/go#11570. Reviewed-on: https://go-review.googlesource.com/12543 From-SVN: r226448
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@ -1,4 +1,4 @@
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9931f2c150e2da4b7d468db332823d8ef4fb8c34
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4c676d965c19b9c5d5e5049d0f8070502e9c27b0
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The first line of this file holds the git revision number of the last
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merge done from the gofrontend repository.
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@ -3154,6 +3154,28 @@ Check_types_traverse::variable(Named_object* named_object)
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reason.c_str());
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var->clear_init();
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}
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else if (init != NULL
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&& init->func_expression() != NULL)
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{
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Named_object* no = init->func_expression()->named_object();
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Function_type* fntype;
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if (no->is_function())
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fntype = no->func_value()->type();
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else if (no->is_function_declaration())
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fntype = no->func_declaration_value()->type();
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else
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go_unreachable();
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// Builtin functions cannot be used as function values for variable
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// initialization.
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if (fntype->is_builtin())
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{
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error_at(init->location(),
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"invalid use of special builtin function %qs; "
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"must be called",
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no->message_name().c_str());
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}
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}
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else if (!var->is_used()
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&& !var->is_global()
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&& !var->is_parameter()
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