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(one & clauses)Exactly like #'cond, but on #'*assert*, the following will be checked:
- No duplicate conditions are contained; and
- Exactly one condition is truthy.
Helps avoiding sequential semantics, and related ambiguity
(is a given cond? intentionally or unintentionally sequential?).
For said checking, all conditions are evaluated eagerly, so they should be side-effect free. Only the truthy condition's 'consequence' will be evaluated, and once.
Exactly like `#'cond`, but on `#'*assert*`, the following will be checked: * No duplicate conditions are contained; and * Exactly one condition is truthy. Helps avoiding sequential semantics, and related ambiguity (is a given `cond`? intentionally or unintentionally sequential?). For said checking, all conditions are evaluated eagerly, so they should be side-effect free. Only the truthy condition's 'consequence' will be evaluated, and once.
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