Improve errors and diagnostics · surface-ui/surface@cbda7bb

test raise error if there's no {#match} sub-blocks (Surface.Constructs.CaseTest)

test raise error if default sub-block has content (Surface.Constructs.CaseTest)

test slot raise compile error when a slot arg is bound to a non-existing property (Surface.APITest)

test #for language structure compile error message contains the correct line (Surface.Constructs.ForTest)

test #else language structure raises compile error with complex generator (Surface.Constructs.ForTest)

test validate :css_variant type + options (Surface.APITest)

test raises if reusing generator variable names in :let (Surface.SlotTest)

test raise compile error for invalid :let pattern (clause and opts) (Surface.SlotTest)

test slot raise compile error when a slot arg is bound to a property of type other than :list (Surface.APITest)

test raise compile error for invalid arg expression (multiple clauses) (Surface.SlotTest)

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