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Workaround compiler bug introduced by aa9ca7a 

BUG: trying to upcast Nil (Crystal::NilType) <- NoReturn (Crystal::NoReturnType) (Exception)
  from /crystal/src/compiler/crystal/codegen/cast.cr:668:5 in 'upcast_distinct'
  from /crystal/src/compiler/crystal/codegen/cast.cr:523:15 in 'upcast'
  from /crystal/src/compiler/crystal/codegen/codegen.cr:1369:11 in 'accept'
  from /crystal/src/compiler/crystal/codegen/codegen.cr:2274:9 in 'visit'
  from /crystal/src/compiler/crystal/syntax/visitor.cr:27:12 in 'accept'
...
This commit is contained in:
Michael Miller 2022-07-13 15:40:22 -06:00
parent f1465c44d8
commit 9efb6c95dd
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GPG Key ID: 32B47AE8F388A1FF
1 changed files with 50 additions and 26 deletions
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76
src/spectator/mocks/stubbable.cr
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@ -149,7 +149,14 @@ module Spectator
if %stub = _spectator_find_stub(%call)
# Cast the stub or return value to the expected type.
# This is necessary to match the expected return type of the original method.
_spectator_cast_stub_value(%stub, %call, typeof({{original}}), {{method.return_type && method.return_type.resolve != NoReturn && method.return_type.resolve <= Nil || method.return_type.is_a?(Union) && method.return_type.types.map(&.resolve).includes?(Nil)}})
_spectator_cast_stub_value(%stub, %call, typeof({{original}}),
{{ if method.return_type && method.return_type.resolve == NoReturn
:no_return
elsif method.return_type && method.return_type.resolve <= Nil || method.return_type.is_a?(Union) && method.return_type.types.map(&.resolve).includes?(Nil)
:nil
else
:raise
end }})
else
# Delegate missing stub behavior to concrete type.
_spectator_stub_fallback(%call, typeof({{original}})) do
@ -241,7 +248,14 @@ module Spectator
# This is necessary to match the expected return type of the original method.
{% if method.return_type %}
# Return type restriction takes priority since it can be a superset of the original implementation.
_spectator_cast_stub_value(%stub, %call, {{method.return_type}}, {{method.return_type.resolve != NoReturn && method.return_type.resolve <= Nil || method.return_type.is_a?(Union) && method.return_type.types.map(&.resolve).includes?(Nil)}})
_spectator_cast_stub_value(%stub, %call, {{method.return_type}},
{{ if method.return_type.resolve == NoReturn
:no_return
elsif method.return_type.resolve <= Nil || method.return_type.is_a?(Union) && method.return_type.types.map(&.resolve).includes?(Nil)
:nil
else
:raise
end }})
{% elsif !method.abstract? %}
# The method isn't abstract, infer the type it returns without calling it.
_spectator_cast_stub_value(%stub, %call, typeof({{original}}))
@ -376,8 +390,11 @@ module Spectator
# *stub* is the variable holding the stub.
# *call* is the variable holding the captured method call.
# *type* is the expected type to cast the value to.
# *nullable* indicates whether *type* can be nil or not.
private macro _spectator_cast_stub_value(stub, call, type, nullable = true)
# *fail_cast* indicates the behavior used when the value returned by the stub can't be cast to *type*.
# - `:nil` - return nil.
# - `:raise` - raise a `TypeCastError`.
# - `:no_return` - raise as no value should be returned.
private macro _spectator_cast_stub_value(stub, call, type, fail_cast = :nil)
# Attempt to cast the stub to the method's return type.
# If successful, return the value of the stub.
# This is a common usage where the return type is simple and matches the stub type exactly.
@ -390,29 +407,36 @@ module Spectator
# Assert that it will (this should never fail).
raise TypeCastError.new("Stub has no value") unless {{stub}}.responds_to?(:call)
# Get the value as-is from the stub.
# This will be compiled as a union of all known stubbed value types.
%value = {{stub}}.call({{call}})
{% if fail_cast == :no_return %}
{{stub}}.call({{call}})
raise TypeCastError.new("#{_spectator_stubbed_name} received message #{ {{call}} } and is attempting to return a value, but it shouldn't have returned (`NoReturn`).")
{% else %}
# Get the value as-is from the stub.
# This will be compiled as a union of all known stubbed value types.
%value = {{stub}}.call({{call}})
# Attempt to cast the value to the method's return type.
# If successful, which it will be in most cases, return it.
# The caller will receive a properly typed value without unions or other side-effects.
if %cast = %value.as?({{type}})
%cast
else
{% if nullable %}
nil
{% else %}
# The stubbed value was something else entirely and cannot be cast to the return type.
# There's something weird going on (compiler bug?) that sometimes causes this class lookup to fail.
%type = begin
%value.class.to_s
rescue
"<Unknown>"
end
raise TypeCastError.new("#{_spectator_stubbed_name} received message #{ {{call}} } and is attempting to return a `#{%type}`, but returned type must be `#{ {{type}} }`.")
{% end %}
end
# Attempt to cast the value to the method's return type.
# If successful, which it will be in most cases, return it.
# The caller will receive a properly typed value without unions or other side-effects.
if %cast = %value.as?({{type}})
%cast
else
{% if fail_cast == :nil %}
nil
{% elsif fail_cast == :raise %}
# The stubbed value was something else entirely and cannot be cast to the return type.
# There's something weird going on (compiler bug?) that sometimes causes this class lookup to fail.
%type = begin
%value.class.to_s
rescue
"<Unknown>"
end
raise TypeCastError.new("#{_spectator_stubbed_name} received message #{ {{call}} } and is attempting to return a `#{%type}`, but returned type must be `#{ {{type}} }`.")
{% else %}
{% raise "fail_cast must be :nil, :raise, or :no_return, but got: #{fail_cast}" %}
{% end %}
end
{% end %}
end
end
end