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| -rw-r--r-- | language/statements/index.rst | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/language/statements/index.rst b/language/statements/index.rst index 623eb23..93ff690 100644 --- a/language/statements/index.rst +++ b/language/statements/index.rst @@ -26,6 +26,31 @@ Statements None. +.. crowbar:element:: FragileStatement <- 'fragile' Statement + + Some behaviors are difficult to ensure the robustness of at compile time, and these behaviors are defined in this specification as *fragile*. + Fragile behaviors used outside of fragile statements should produce a compiler error. + + Compile-time Behavior: + + Fragile behaviors used inside a fragile statement must not produce a compiler error for their fragility. + Nesting fragile statements should produce a compiler error. + + Runtime Behavior: + + The contained statement is executed. + +.. crowbar:element:: ExpressionStatement <- Expression ';' + + Compile-time Behavior: + + If the expression is not a function call, the compiler may emit a warning. + + Runtime Behavior: + + The expression is evaluated and the resulting value is discarded. + Function calls must be fully evaluated, but expressions that are not function calls may be optimized out. + .. toctree:: :maxdepth: 1 |