solang-parser 0.2.1

Solang Solidity Parser
Documentation 
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contract A {modifier m virtual;}

abstract contract B {modifier m virtual;}
contract C is B { }

abstract contract D {modifier m;}
// ----
// TypeError 3656: (0-32): Contract "A" should be marked as abstract.
// TypeError 3656: (76-95): Contract "C" should be marked as abstract.
// TypeError 8063: (118-129): Modifiers without implementation must be marked virtual.