Why does a recursive descent parser in a compiler, designed for a context-free language, fail to correctly parse some valid programs?

💡 Explanation

The parser enters an infinite loop because left recursion causes the parser to repeatedly call the same rule without consuming any input, therefore it never advances. Semantic analysis and lexical ambiguity do not halt parsing; rather than causing infinite loops.

• If a speaker abruptly shifts from discussing urban development to astrophysics without signaling, which consequence follows in a listener's comprehension?
• Why does transcribing speech in a noisy environment require careful acoustic analysis of consonant sounds, especially fricatives and plosives?
• An advertising campaign seeks to reduce smoking among teenagers. If graphic images of lung cancer are shown, which consequence follows?
• Why does sentiment analysis on tweets mentioning a brand often misclassify sarcasm?
• A linguist analyzes a specialized corpus of historical scientific texts with inconsistent spelling. Which process MOST accurately identifies related terms despite orthographic variations, considering the computational expense?
• A robotic assistant receives a series of commands, including 'Put that over there,' but loses its spatial map intermittently. Which failure mode is most likely, preventing correct action?